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      <article itemscope="" itemtype="http://schema.org/Article" data-itemscope="root">
        <h1 itemprop="headline">Risk factors relate to the variability of health outcomes as well as
          the mean: A GAMLSS tutorial</h1>
        <meta itemprop="image"
          content="https://via.placeholder.com/1200x714/dbdbdb/4a4a4a.png?text=Risk%20factors%20relate%20to%20the%20variability%20of%20health%20outcomes%20as%20well%20as%20the%20mean:%20A%20GAMLSS%20tutorial">
        <ol data-itemprop="authors">
          <li itemscope="" itemtype="http://schema.org/Person" itemprop="author">
            <meta itemprop="name" content="David Bann"><span data-itemprop="givenNames"><span
                itemprop="givenName">David</span></span><span data-itemprop="familyNames"><span
                itemprop="familyName">Bann</span></span><span data-itemprop="emails"><a
                itemprop="email"
                href="mailto:david.bann@ucl.ac.uk">david.bann@ucl.ac.uk</a></span><span
              data-itemprop="affiliations"><a itemprop="affiliation"
                href="#author-organization-1">1</a></span>
          </li>
          <li itemscope="" itemtype="http://schema.org/Person" itemprop="author">
            <meta itemprop="name" content="Liam Wright"><span data-itemprop="givenNames"><span
                itemprop="givenName">Liam</span></span><span data-itemprop="familyNames"><span
                itemprop="familyName">Wright</span></span><span data-itemprop="affiliations"><a
                itemprop="affiliation" href="#author-organization-1">1</a></span>
          </li>
          <li itemscope="" itemtype="http://schema.org/Person" itemprop="author">
            <meta itemprop="name" content="Tim J Cole"><span data-itemprop="givenNames"><span
                itemprop="givenName">Tim</span><span itemprop="givenName">J</span></span><span
              data-itemprop="familyNames"><span itemprop="familyName">Cole</span></span><span
              data-itemprop="affiliations"><a itemprop="affiliation"
                href="#author-organization-2">2</a></span>
          </li>
        </ol>
        <ol data-itemprop="affiliations">
          <li itemscope="" itemtype="http://schema.org/Organization" itemid="#author-organization-1"
            id="author-organization-1"><span itemprop="name">Centre for Longitudinal Studies, Social
              Research Institute, University College London</span><address itemscope=""
              itemtype="http://schema.org/PostalAddress" itemprop="address"><span
                itemprop="addressLocality">London</span><span itemprop="addressCountry">United
                Kingdom</span></address></li>
          <li itemscope="" itemtype="http://schema.org/Organization" itemid="#author-organization-2"
            id="author-organization-2"><span itemprop="name">Great Ormond Street Institute of Child
              Health, University College London</span><address itemscope=""
              itemtype="http://schema.org/PostalAddress" itemprop="address"><span
                itemprop="addressLocality">London</span><span itemprop="addressCountry">United
                Kingdom</span></address></li>
        </ol><span itemscope="" itemtype="http://schema.org/Organization" itemprop="publisher">
          <meta itemprop="name" content="Unknown"><span itemscope=""
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            <meta itemprop="url"
              content="https://via.placeholder.com/600x60/dbdbdb/4a4a4a.png?text=Unknown">
          </span>
        </span><time itemprop="datePublished" datetime="2022-01-05">2022-01-05</time>
        <ul data-itemprop="genre">
          <li itemprop="genre">Research Article</li>
        </ul>
        <ul data-itemprop="about">
          <li itemscope="" itemtype="http://schema.org/DefinedTerm" itemprop="about"><span
              itemprop="name">Epidemiology and Global Health</span></li>
        </ul>
        <ul data-itemprop="keywords">
          <li itemprop="keywords">epidemiological methods</li>
          <li itemprop="keywords">distributions</li>
          <li itemprop="keywords">body mass index</li>
          <li itemprop="keywords">mental health</li>
          <li itemprop="keywords">GAMLSS</li>
          <li itemprop="keywords">Human</li>
        </ul>
        <ul data-itemprop="identifiers">
          <li itemscope="" itemtype="http://schema.org/PropertyValue" itemprop="identifier">
            <meta itemprop="propertyID"
              content="https://registry.identifiers.org/registry/publisher-id"><span
              itemprop="name">publisher-id</span><span itemprop="value"
              data-itemtype="http://schema.org/Number">72357</span>
          </li>
          <li itemscope="" itemtype="http://schema.org/PropertyValue" itemprop="identifier">
            <meta itemprop="propertyID" content="https://registry.identifiers.org/registry/doi">
            <span itemprop="name">doi</span><span itemprop="value">10.7554/eLife.72357</span>
          </li>
          <li itemscope="" itemtype="http://schema.org/PropertyValue" itemprop="identifier">
            <meta itemprop="propertyID"
              content="https://registry.identifiers.org/registry/elocation-id"><span
              itemprop="name">elocation-id</span><span itemprop="value">e72357</span>
          </li>
        </ul>
        <section data-itemprop="description">
          <h2 data-itemtype="http://schema.stenci.la/Heading">Abstract</h2>
          <meta itemprop="description"
            content="Risk factors or interventions may affect the variability as well as the mean of health outcomes. Understanding this can aid aetiological understanding and public health translation, in that interventions which shift the outcome mean and reduce variability are typically preferable to those which affect only the mean. However, most commonly used statistical tools do not test for differences in variability. Tools that do have few epidemiological applications to date, and fewer applications still have attempted to explain their resulting findings. We thus provide a tutorial for investigating this using GAMLSS (Generalised Additive Models for Location, Scale and Shape). The 1970 British birth cohort study was used, with body mass index (BMI; N = 6007) and mental wellbeing (Warwick-Edinburgh Mental Wellbeing Scale; N = 7104) measured in midlife (42–46 years) as outcomes. We used GAMLSS to investigate how multiple risk factors (sex, childhood social class, and midlife physical inactivity) related to differences in health outcome mean and variability. Risk factors were related to sizable differences in outcome variability—for example males had marginally higher mean BMI yet 28% lower variability; lower social class and physical inactivity were each associated with higher mean and higher variability (6.1% and 13.5% higher variability, respectively). For mental wellbeing, gender was not associated with the mean while males had lower variability (–3.9%); lower social class and physical inactivity were each associated with lower mean yet higher variability (7.2% and 10.9% higher variability, respectively). The results highlight how GAMLSS can be used to investigate how risk factors or interventions may influence the variability in health outcomes. This underutilised approach to the analysis of continuously distributed outcomes may have broader utility in epidemiologic, medical, and psychological sciences. A tutorial and replication syntax is provided online to facilitate this (https://osf.io/5tvz6/). DB is supported by the Economic and Social Research Council (grant number ES/M001660/1), The Academy of Medical Sciences / Wellcome Trust (“Springboard Health of the Public in 2040” award: HOP001/1025); DB and LW are supported by the Medical Research Council (MR/V002147/1). The funders had no role in study design, data collection and analysis, decision to publish, or preparation of the manuscript.">
          <p itemscope="" itemtype="http://schema.stenci.la/Paragraph">Risk factors or interventions
            may affect the variability as well as the mean of health outcomes. Understanding this
            can aid aetiological understanding and public health translation, in that interventions
            which shift the outcome mean and reduce variability are typically preferable to those
            which affect only the mean. However, most commonly used statistical tools do not test
            for differences in variability. Tools that do have few epidemiological applications to
            date, and fewer applications still have attempted to explain their resulting findings.
            We thus provide a tutorial for investigating this using GAMLSS (Generalised Additive
            Models for Location, Scale and Shape).</p>
          <p itemscope="" itemtype="http://schema.stenci.la/Paragraph">The 1970 British birth cohort
            study was used, with body mass index (BMI; N = 6007) and mental wellbeing
            (Warwick-Edinburgh Mental Wellbeing Scale; N = 7104) measured in midlife (42–46 years)
            as outcomes. We used GAMLSS to investigate how multiple risk factors (sex, childhood
            social class, and midlife physical inactivity) related to differences in health outcome
            mean and variability.</p>
          <p itemscope="" itemtype="http://schema.stenci.la/Paragraph">Risk factors were related to
            sizable differences in outcome variability—for example males had marginally higher mean
            BMI yet 28% lower variability; lower social class and physical inactivity were each
            associated with higher mean and higher variability (6.1% and 13.5% higher variability,
            respectively). For mental wellbeing, gender was not associated with the mean while males
            had lower variability (–3.9%); lower social class and physical inactivity were each
            associated with lower mean yet higher variability (7.2% and 10.9% higher variability,
            respectively).</p>
          <p itemscope="" itemtype="http://schema.stenci.la/Paragraph">The results highlight how
            GAMLSS can be used to investigate how risk factors or interventions may influence the
            variability in health outcomes. This underutilised approach to the analysis of
            continuously distributed outcomes may have broader utility in epidemiologic, medical,
            and psychological sciences. A tutorial and replication syntax is provided online to
            facilitate this (<a href="https://osf.io/5tvz6/" itemscope=""
              itemtype="http://schema.stenci.la/Link">https://osf.io/5tvz6/</a>).</p>
          <p itemscope="" itemtype="http://schema.stenci.la/Paragraph">DB is supported by the
            Economic and Social Research Council (grant number ES/M001660/1), The Academy of Medical
            Sciences / Wellcome Trust (“Springboard Health of the Public in 2040” award:
            HOP001/1025); DB and LW are supported by the Medical Research Council (MR/V002147/1).
            The funders had no role in study design, data collection and analysis, decision to
            publish, or preparation of the manuscript.</p>
        </section>
        <h2 itemscope="" itemtype="http://schema.stenci.la/Heading" id="introduction">Introduction
        </h2>
        <p itemscope="" itemtype="http://schema.stenci.la/Paragraph">What is health? Contrary to
          simplistic notions of its being defined as the absence of disease, it is now increasingly
          understood that most outcomes of public health significance are continuous in nature <cite
            itemscope="" itemtype="http://schema.stenci.la/Cite"><a
              href="#bib25"><span>25</span><span>Keyes and Galea</span><span>2016</span></a></cite>.
          This applies to both physical and mental health outcomes <span itemscope=""
            itemtype="http://schema.stenci.la/CiteGroup"><cite itemscope=""
              itemtype="http://schema.stenci.la/Cite"><a href="#bib37"><span>37</span><span>Plomin
                  et al.</span><span>2009</span></a></cite><cite itemscope=""
              itemtype="http://schema.stenci.la/Cite"><a
                href="#bib24"><span>24</span><span>Keyes</span><span>2002</span></a></cite></span>.
          The use of binary endpoints, while having utility in clinical applications, should not
          hinder investigation of the influences of health outcomes which are ultimately continuous.
          Further, analysing the determinants of health using continuous rather than binary outcomes
          is beneficial both practically (with more statistical power and less information loss) and
          substantively (greater aetiological understanding). Indeed, those at high risk of a
          developing an illness may comprise a minority of those who ultimately succumb <cite
            itemscope="" itemtype="http://schema.stenci.la/Cite"><a
              href="#bib41"><span>41</span><span>Rose</span><span>2001</span></a></cite>.</p>
        <p itemscope="" itemtype="http://schema.stenci.la/Paragraph">Studies into the effect on
          continuous outcomes of exposures, be they risk factors in observational studies or
          interventions in randomised trials, typically focus on mean differences in the outcome,
          using linear regression. However linear regression assumes homoscedasticity, that is that
          the variability of the outcome is unrelated to the exposure, and often this is not the
          case. It is possible to extend regression analysis to model the variability as well as the
          mean, and this has benefits in terms of not only the model’s fit but also its
          interpretation. If for example the intervention in a trial can be shown to reduce
          variability in the outcome, this could reasonably be viewed as evidence of intervention
          success <cite itemscope="" itemtype="http://schema.stenci.la/Cite"><a
              href="#bib50"><span>50</span><span>Subramanian et
                al.</span><span>2018</span></a></cite> independent of the intervention’s effect on
          the mean. Treatment for refractive vision errors—glasses, contact lenses, and/or
          corrective surgery—seeks to improve vision by shifting individuals towards a specified
          standard (e.g. 20/20 vision) <cite itemscope="" itemtype="http://schema.stenci.la/Cite"><a
              href="#bib55"><span>55</span><span>Vitale et al.</span><span>2006</span></a></cite>.
          Successful treatments alter the mean refraction, but they are even more successful if they
          also reduce the substantial variability in refraction arising from the mix of short- and
          long-sighted individuals.</p>
        <p itemscope="" itemtype="http://schema.stenci.la/Paragraph">Similarly, obesity
          interventions aim to reduce body mass index (BMI) and shift treated individuals from
          overweight (25–30 kg/m<sup itemscope=""
            itemtype="http://schema.stenci.la/Superscript"><span
              data-itemtype="http://schema.org/Number">2</span></sup>), obese ( &gt; 30 kg/m<sup
            itemscope="" itemtype="http://schema.stenci.la/Superscript"><span
              data-itemtype="http://schema.org/Number">2</span></sup>), or severely obese ( &gt; 45
          kg/m<sup itemscope="" itemtype="http://schema.stenci.la/Superscript"><span
              data-itemtype="http://schema.org/Number">2</span></sup>) to the normal range (20–25
          kg/m<sup itemscope="" itemtype="http://schema.stenci.la/Superscript"><span
              data-itemtype="http://schema.org/Number">2</span></sup>). However, here the effect of
          the intervention on variability is often to increase it. Even if not formally tested,
          visual comparisons of outcome distributions of some influential trials suggest that weight
          loss interventions increase rather than reduce BMI variability, <cite itemscope=""
            itemtype="http://schema.stenci.la/Cite"><a href="#bib53"><span>53</span><span>Truby et
                al.</span><span>2006</span></a></cite> presumably since they are effective in some
          but not all participants.</p>
        <p itemscope="" itemtype="http://schema.stenci.la/Paragraph">Understanding if and how risk
          factors influence variability in health outcomes has aetiological significance, consistent
          with the goal of epidemiological science to understand the <em itemscope=""
            itemtype="http://schema.stenci.la/Emphasis">distribution</em> of health <cite
            itemscope="" itemtype="http://schema.stenci.la/Cite"><a
              href="#bib38"><span>38</span><span>Porta</span><span>2008</span></a></cite>. Risk
          factors could feasibly affect outcome variability yet not affect the mean—for example, one
          study found that breastfeeding was not related to mean childhood BMI, yet was related to
          lower childhood BMI variability <cite itemscope=""
            itemtype="http://schema.stenci.la/Cite"><a href="#bib6"><span>6</span><span>Beyerlein et
                al.</span><span>2008</span></a></cite>. Similarly, sex may affect variability and/or
          average levels of an outcome—for instance, males may have greater variability than females
          in some cognitive traits <cite itemscope="" itemtype="http://schema.stenci.la/Cite"><a
              href="#bib21"><span>21</span><span>Hyde</span><span>2014</span></a></cite> and brain
          structures <cite itemscope="" itemtype="http://schema.stenci.la/Cite"><a
              href="#bib56"><span>56</span><span>Wierenga et al.</span><span>2022</span></a></cite>.
        </p>
        <p itemscope="" itemtype="http://schema.stenci.la/Paragraph">Identifying associations
          between risk factors and outcome variability may also be useful to identify the absence or
          presence of heterogeneity in susceptibility to interventions or risk factors and thus aid
          aetiological understanding. Indeed, the finding that substantial increases in mean BMI in
          recent decades have been matched by increases in BMI variability indicates that there may
          be differential susceptibility to the obesogenic environment <span itemscope=""
            itemtype="http://schema.stenci.la/CiteGroup"><cite itemscope=""
              itemtype="http://schema.stenci.la/Cite"><a href="#bib17"><span>17</span><span>Flegal
                  and Troiano</span><span>2000</span></a></cite><cite itemscope=""
              itemtype="http://schema.stenci.la/Cite"><a href="#bib23"><span>23</span><span>Johnson
                  et al.</span><span>2015</span></a></cite></span>. In the context of randomised
          controlled trials, the finding of variability in treatment effects between individuals has
          been used to justify individualised approaches to treatment (personalised medicine).
          Reflecting the challenges of empirically testing this, however, five separate
          meta-analyses have tested heterogeneity in response to antidepressant therapy; despite
          using the same dataset, different methods and divergent conclusions were drawn <cite
            itemscope="" itemtype="http://schema.stenci.la/Cite"><a
              href="#bib29"><span>29</span><span>Luedtke and
                Kessler</span><span>2021</span></a></cite>.</p>
        <p itemscope="" itemtype="http://schema.stenci.la/Paragraph">Another advantage of modelling
          varability arises in common situations where the outcome under study is non-linearly
          related to other outcomes of interest. For instance, BMI influences mortality and
          morbidity rates, but the relationship between BMI and mortality is thought to be J-shaped
          ( <cite itemscope="" itemtype="http://schema.stenci.la/Cite"><a
              href="#bib8"><span>8</span><span>Bhaskaran et al.</span><span>2018</span></a></cite>)
          compared with those in the normal range, mortality risks are greater for those who are
          under- or overweight. In this case, the total effect of an intervention to reduce BMI on
          these wider outcomes is not fully captured by its average BMI effect. Rather,
          understanding the total distributional effect on BMI is required.</p>
        <p itemscope="" itemtype="http://schema.stenci.la/Paragraph"><a href="#fig1" itemscope=""
            itemtype="http://schema.stenci.la/Link">Figure 1</a> shows three hypothetical scenarios
          for an intervention to affect the distribution of an outcome. In the first case (Panel A),
          the intervention has an impact that is consistent across the population: all individuals
          are affected and to the same extent. In the second case (Panel B), the intervention has
          the same mean impact, but variability is also increased: some are positively affected,
          others negatively. In the third case (Panel C), the mean is again increased, but so is
          skewness. There is heterogeneity in response, with some seeing more positive responses
          than others. The policy implications may be different in each case. In the second and
          third scenarios, efforts could be directed to identify those who are (more) positively
          impacted, so as to increase the net benefit or cost-effectiveness of the intervention.
          Indeed, in a choice between interventions, an intervention generating lower expected
          benefits but smaller variability in outcomes may be chosen, in so far as reducing
          inequalities is seen as a policy goal in itself.</p>
        <figure itemscope="" itemtype="http://schema.stenci.la/Figure" id="fig1" title="Figure 1.">
          <label data-itemprop="label">Figure 1.</label><img src="index.html.media/fig1.jpg" alt=""
            itemscope="" itemtype="http://schema.org/ImageObject">
          <figcaption>
            <h3 itemscope="" itemtype="http://schema.stenci.la/Heading"
              id="simulated-data-for-three-interventions-each-having-the-same-effect-on-the-mean-but-different-effects-on-the-variability-middle-panel-and-skewness-bottom-panel">
              Simulated data for three interventions each having the same effect on the mean, but
              different effects on the variability (middle panel) and skewness (bottom panel).</h3>
          </figcaption>
        </figure>
        <p itemscope="" itemtype="http://schema.stenci.la/Paragraph">Recent studies in biological
          <span itemscope="" itemtype="http://schema.stenci.la/CiteGroup"><cite itemscope=""
              itemtype="http://schema.stenci.la/Cite"><a href="#bib51"><span>51</span><span>Sun et
                  al.</span><span>2020</span></a></cite><cite itemscope=""
              itemtype="http://schema.stenci.la/Cite"><a href="#bib34"><span>34</span><span>Nakagawa
                  et al.</span><span>2014</span></a></cite></span>, environmental <cite itemscope=""
            itemtype="http://schema.stenci.la/Cite"><a href="#bib36"><span>36</span><span>Pitt et
                al.</span><span>2020</span></a></cite>, and economic science <span itemscope=""
            itemtype="http://schema.stenci.la/CiteGroup"><cite itemscope=""
              itemtype="http://schema.stenci.la/Cite"><a href="#bib20"><span>20</span><span>Hohberg
                  et al.</span><span>2020</span></a></cite><cite itemscope=""
              itemtype="http://schema.stenci.la/Cite"><a
                href="#bib45"><span>45</span><span>Silbersdorff and
                  Schneider</span><span>2019</span></a></cite><cite itemscope=""
              itemtype="http://schema.stenci.la/Cite"><a
                href="#bib44"><span>44</span><span>Silbersdorff et
                  al.</span><span>2018</span></a></cite></span> have begun to examine how risk
          factors relate to the distribution of the outcome of interest. However, there have been
          few epidemiological applications of this approach to date; <cite itemscope=""
            itemtype="http://schema.stenci.la/Cite"><a href="#bib5"><span>5</span><span>Beyerlein et
                al.</span><span>2008</span></a></cite> and fewer still that provide explanations for
          such findings, which are essential if such methods are to have utility. Indeed, one recent
          study which investigated the association between mental health symptoms and lower income
          explicitly avoided interpretation of its findings on variability, focusing instead on
          issues relating to the application of such methods <cite itemscope=""
            itemtype="http://schema.stenci.la/Cite"><a
              href="#bib45"><span>45</span><span>Silbersdorff and
                Schneider</span><span>2019</span></a></cite>.</p>
        <p itemscope="" itemtype="http://schema.stenci.la/Paragraph">Regression methods that allow
          variability to be modelled are uncommon. One particular method, Generalised Additive
          Models for Location, Scale and Shape (GAMLSS) <cite itemscope=""
            itemtype="http://schema.stenci.la/Cite"><a href="#bib39"><span>39</span><span>Rigby and
                Stasinopoulos</span><span>2005</span></a></cite> has become the standard for
          constructing growth reference centiles, <cite itemscope=""
            itemtype="http://schema.stenci.la/Cite"><a href="#bib11"><span>11</span><span>Cole et
                al.</span><span>2009</span></a></cite> where the aim is to model the outcome’s
          distribution as a function of age. It defines the distribution in terms of distribution
          moments, i.e. the mean, variance, and optionally skewness and kurtosis. This allows for
          factors influencing the higher moments to be identified in just the same way as for the
          mean, and it provides a simple and elegant interface for modelling variability in
          epidemiology.</p>
        <p itemscope="" itemtype="http://schema.stenci.la/Paragraph">Another arguably underutilised
          <cite itemscope="" itemtype="http://schema.stenci.la/Cite"><a
              href="#bib7"><span>7</span><span>Beyerlein</span><span>2014</span></a></cite> and
          related statistical approach to investigating risk factors for continuous outcomes is
          quantile regression. Recent epidemiological studies using this method have found that risk
          factors for higher BMI—particularly lower social class and physical inactivity—have
          sizably larger effect sizes at higher BMI centiles <span itemscope=""
            itemtype="http://schema.stenci.la/CiteGroup"><cite itemscope=""
              itemtype="http://schema.stenci.la/Cite"><a href="#bib3"><span>3</span><span>Bann et
                  al.</span><span>2020</span></a></cite><cite itemscope=""
              itemtype="http://schema.stenci.la/Cite"><a href="#bib19"><span>19</span><span>Green
                  and Rowe</span><span>2020</span></a></cite></span>. This has potentially important
          policy implications—risk factors which have larger effects amongst those at highest health
          risk are likely to have a more favourable effect on population health than alternatives
          which do not <cite itemscope="" itemtype="http://schema.stenci.la/Cite"><a
              href="#bib3"><span>3</span><span>Bann et al.</span><span>2020</span></a></cite>.
          However, the reason for this phenomenon is not yet understood—it is likely to be logically
          consistent with results of GAMLSS analyses in which risk factors influence outcome means,
          variability and/or skewness.</p>
        <p itemscope="" itemtype="http://schema.stenci.la/Paragraph">In this paper, we provide a
          worked example of the use and interpretation of GAMLSS. Accompanying this is an online
          tutorial and full replication syntax for running GAMLSS in R (<a
            href="https://osf.io/5tvz6/" itemscope=""
            itemtype="http://schema.stenci.la/Link">https://osf.io/5tvz6/</a>). We investigate
          whether and how several established risk factors—sex, childhood socioeconomic
          circumstances, and physical inactivity <cite itemscope=""
            itemtype="http://schema.stenci.la/Cite"><a href="#bib49"><span>49</span><span>Stringhini
                et al.</span><span>2017</span></a></cite>—relate to differences in outcome mean and
          variability. We choose two different continuous outcomes, an indicator of adiposity (body
          mass index, BMI) and mental wellbeing. These are two weakly correlated health outcomes,
          each of independent importance to population health. Each risk factor-outcome combination
          is the subject of previous (separate) literature which focuses largely on mean differences
          only. For instance, low socioeconomic position in childhood has been repeatedly related to
          higher BMI <span itemscope="" itemtype="http://schema.stenci.la/CiteGroup"><cite
              itemscope="" itemtype="http://schema.stenci.la/Cite"><a
                href="#bib2"><span>2</span><span>Bann et al.</span><span>2018</span></a></cite><cite
              itemscope="" itemtype="http://schema.stenci.la/Cite"><a
                href="#bib42"><span>42</span><span>Senese et
                  al.</span><span>2009</span></a></cite></span> and worse mental wellbeing in
          adulthood; <span itemscope="" itemtype="http://schema.stenci.la/CiteGroup"><cite
              itemscope="" itemtype="http://schema.stenci.la/Cite"><a
                href="#bib58"><span>58</span><span>Wood et
                  al.</span><span>2021</span></a></cite><cite itemscope=""
              itemtype="http://schema.stenci.la/Cite"><a href="#bib46"><span>46</span><span>Simanek
                  et al.</span><span>2021</span></a></cite><cite itemscope=""
              itemtype="http://schema.stenci.la/Cite"><a href="#bib57"><span>57</span><span>Wood et
                  al.</span><span>2017</span></a></cite></span> greater physical activity has
          notable likely bi-directional links with lower BMI ; <cite itemscope=""
            itemtype="http://schema.stenci.la/Cite"><a href="#bib22"><span>22</span><span>Jakicic et
                al.</span><span>2019</span></a></cite> and higher wellbeing; <span itemscope=""
            itemtype="http://schema.stenci.la/CiteGroup"><cite itemscope=""
              itemtype="http://schema.stenci.la/Cite"><a href="#bib9"><span>9</span><span>Black et
                  al.</span><span>2015</span></a></cite><cite itemscope=""
              itemtype="http://schema.stenci.la/Cite"><a href="#bib10"><span>10</span><span>Choi et
                  al.</span><span>2019</span></a></cite><cite itemscope=""
              itemtype="http://schema.stenci.la/Cite"><a href="#bib35"><span>35</span><span>Pinto
                  Pereira et al.</span><span>2014</span></a></cite></span> while males and females
          seemingly have similar mean BMI and wellbeing, <cite itemscope=""
            itemtype="http://schema.stenci.la/Cite"><a href="#bib57"><span>57</span><span>Wood et
                al.</span><span>2017</span></a></cite> this may mask differences in variability or
          skewness, as suggested in the sizable sex differences in overweight and obesity rates
          <cite itemscope="" itemtype="http://schema.stenci.la/Cite"><a
              href="#bib12"><span>12</span><span>Conolly et al.</span><span>2017</span></a></cite>.
        </p>
        <p itemscope="" itemtype="http://schema.stenci.la/Paragraph">The further investigation of
          differences in variability and skewness in these outcomes is therefore arguably of
          substantive interest, providing further motivation to the tutorial content. We highlight
          the contribution of GAMLSS by contrasting results with the more commonly used linear
          regression and (less commonly used) quantile regression models.</p>
        <h2 itemscope="" itemtype="http://schema.stenci.la/Heading" id="methods">Methods</h2>
        <h3 itemscope="" itemtype="http://schema.stenci.la/Heading" id="study-sample">Study sample
        </h3>
        <p itemscope="" itemtype="http://schema.stenci.la/Paragraph">The 1970 British birth cohort
          study consists of all 17,196 babies born in Britain during one week of March 1970, with 9
          subsequent waves of follow-up from childhood to midlife <cite itemscope=""
            itemtype="http://schema.stenci.la/Cite"><a href="#bib16"><span>16</span><span>Elliott
                and Shepherd</span><span>2006</span></a></cite> At the most recent wave (46 years),
          12,368 eligible participants (those alive and not lost to follow-up) were invited to be
          interviewed at home by trained research staff—8581 participants provided at least some
          data in this wave. At all waves, informed consent was provided and ethical approval
          granted.</p>
        <h3 itemscope="" itemtype="http://schema.stenci.la/Heading" id="health-outcomes">Health
          outcomes</h3>
        <p itemscope="" itemtype="http://schema.stenci.la/Paragraph">We selected two outcomes in
          midlife which capture different dimensions of health and are continuously distributed:
          adiposity (BMI), and mental wellbeing (Warwick-Edinburgh Mental Wellbeing Scale (WEMWBS)).
          BMI was measured at 46 years, and wellbeing at 42 years <cite itemscope=""
            itemtype="http://schema.stenci.la/Cite"><a href="#bib58"><span>58</span><span>Wood et
                al.</span><span>2021</span></a></cite> WEMWBS consists of 14 positively worded
          items—such as “I’ve been feeling optimistic about the future” and “…feeling
          cheerful”—measured on a five-point Likert scale, which are summed to give a total
          well-being score ranging from 14 to 70 (highest well-being) <cite itemscope=""
            itemtype="http://schema.stenci.la/Cite"><a href="#bib52"><span>52</span><span>Tennant et
                al.</span><span>2007</span></a></cite>.</p>
        <h3 itemscope="" itemtype="http://schema.stenci.la/Heading" id="risk-factors">Risk factors
        </h3>
        <p itemscope="" itemtype="http://schema.stenci.la/Paragraph">We chose three risk factors
          across different domains—each of them likely to independently influence health outcomes
          <cite itemscope="" itemtype="http://schema.stenci.la/Cite"><a
              href="#bib49"><span>49</span><span>Stringhini et
                al.</span><span>2017</span></a></cite>. They were coded as binary variables to
          simplify comparison of descriptive and GAMLSS results: sex (female/male), socioeconomic
          position (social class at birth; coded as non-manual/manual), and a behavioural risk
          factor (reported physical activity at 42 years; reported days in which the participant
          took part in exercise for 30 min or more in a typical week ‘working hard enough to raise
          your heart rate and break into a sweat’, coded as active ( ≥ 1 days)/inactive (0 days)).
          We examined if the binary split of risk factors influenced the inferences drawn—additional
          analyses were conducted with them coded instead as categorical variables (social class in
          six categories and physical inactivity from 0 to 7 days).</p>
        <h3 itemscope="" itemtype="http://schema.stenci.la/Heading" id="analytical-strategy">
          Analytical strategy</h3>
        <p itemscope="" itemtype="http://schema.stenci.la/Paragraph">To visually inspect the outcome
          distributions and their differences across risk factor groups, we first plotted separate
          kernel density estimates alongside relevant descriptive statistics (mean, standard
          deviation, and coefficient of variation [CoV = SD/mean]). This enables a descriptive
          depiction of variability, with unadjusted GAMLSS results corresponding to each descriptive
          statistic. We then used GAMLSS <cite itemscope=""
            itemtype="http://schema.stenci.la/Cite"><a href="#bib39"><span>39</span><span>Rigby and
                Stasinopoulos</span><span>2005</span></a></cite> separately with each outcome, to
          formally investigate whether risk factors were associated with (1) differences in mean
          outcome, (2) differences in outcome variability, and (3) differences in outcome skewness.
          Linear regression analysis, in contrast, only enables mean differences in outcomes to be
          investigated.</p>
        <p itemscope="" itemtype="http://schema.stenci.la/Paragraph">GAMLSS is a form of regression
          analysis that estimates different ‘moments’ of the outcome distribution. The first moment
          is the location (see mean in <a href="#fig1" itemscope=""
            itemtype="http://schema.stenci.la/Link">Figure 1</a> panel a), the second is variance,
          which specifies the scale or spread (SD in <a href="#fig1" itemscope=""
            itemtype="http://schema.stenci.la/Link">Figure 1</a> panel b) the third is skewness
          which quantifies the relative size of the distribution tails (<a href="#fig1" itemscope=""
            itemtype="http://schema.stenci.la/Link">Figure 1</a> panel c). As in linear regression
          analyses covariates can optionally be included, and appropriate link functions can be
          chosen for use.</p>
        <p itemscope="" itemtype="http://schema.stenci.la/Paragraph">GAMLSS requires that the
          distribution is specified at the outset. In this tutorial we use two distributions which
          we recommend for use in epidemiological research of continuous outcomes. First, the normal
          distribution (called NO in GAMLSS), where location is measured by the mean and scale by
          the standard deviation (SD). The normal distribution has no ‘shape’ moments, as there is
          no skewness and kurtosis is fixed.</p>
        <p itemscope="" itemtype="http://schema.stenci.la/Paragraph">Second, a more complex
          distribution which enables skewness to be investigated: the Box-Cox Cole and Green (BCCG).
          Here location is the median, scale is the generalised coefficient of variation (CoV),
          which is calculated in the normal case as SD/mean, and shape is skewness as defined by the
          Box-Cox power required to transform the outcome distribution to normality. The
          transformation requires the outcome to be on the positive line, so zero or negative values
          are excluded. BCCG is effectively NO with added skewness, though parameterised
          differently. A Box-Cox power of 1 indicates that the distribution is normal, 0 is
          log-normal and –1 inverse normal, so a smaller (i.e. more negative) power corresponds to
          more right skewness.</p>
        <p itemscope="" itemtype="http://schema.stenci.la/Paragraph">After choosing a distribution,
          linear models are used to specify the relationship between the independent variables and
          the different moments of the outcome distribution. As with other regression models, GAMLSS
          provides a standard error for each estimated coefficient, from which 95% confidence
          intervals can be calculated. We note that more experienced users may wish to use
          alternative distributions which GAMLSS facilitates <cite itemscope=""
            itemtype="http://schema.stenci.la/Cite"><a href="#bib40"><span>40</span><span>Rigby et
                al.</span><span>2019</span></a></cite>.</p>
        <p itemscope="" itemtype="http://schema.stenci.la/Paragraph">In our primary analyses we used
          the NO and BCCG families. Differences in variability are modelled with a log link, and can
          be multiplied by 100 and interpreted as percentage differences in variability to aid
          interpretation <cite itemscope="" itemtype="http://schema.stenci.la/Cite"><a
              href="#bib26"><span>26</span><span>Lewontin</span><span>1966</span></a></cite>.
          Differences in the mean and median were also analysed as percentages, to aid comparability
          across outcomes and model estimates. To aid comparison of descriptive statistics and model
          estimation results, we first conducted analyses adjusting for each risk factor alone. We
          then adjusted for the risk factors jointly.</p>
        <p itemscope="" itemtype="http://schema.stenci.la/Paragraph">Separately we fitted
          conditional quantile regression models to estimate risk factor and BMI associations at the
          lower, middle and upper quartiles of the outcome distribution, that is the 25th, 50th, and
          75th centiles.</p>
        <p itemscope="" itemtype="http://schema.stenci.la/Paragraph">All analyses were conducted
          using R v4.1.1. We used the <em itemscope=""
            itemtype="http://schema.stenci.la/Emphasis">gamlss</em> package version 5.3–4 to produce
          gamlss models <cite itemscope="" itemtype="http://schema.stenci.la/Cite"><a
              href="#bib48"><span>48</span><span>Stasinopoulos and
                Rigby</span><span>2007</span></a></cite>. Syntax to replicate all analyses is
          presented online (<a href="https://osf.io/5tvz6/" itemscope=""
            itemtype="http://schema.stenci.la/Link">https://osf.io/5tvz6/</a>).</p>
        <h2 itemscope="" itemtype="http://schema.stenci.la/Heading" id="results">Results</h2>
        <p itemscope="" itemtype="http://schema.stenci.la/Paragraph">A total of 6007 participants
          had valid data for BMI and all risk factors, and 7104 for WEMWBS. Mean BMI was 28.4 (SD =
          5.5), and mean WEMWBS 49.2 (8.3). Higher BMI was weakly associated with lower wellbeing
          (<em itemscope="" itemtype="http://schema.stenci.la/Emphasis">r</em> = –0.07, p &lt;
          0.01). BMI was moderately right-skewed (<a href="#fig2" itemscope=""
            itemtype="http://schema.stenci.la/Link">Figure 2</a>, left panel) and WEMWBS left-skewed
          (<a href="#fig2" itemscope="" itemtype="http://schema.stenci.la/Link">Figure 2</a>, right
          panel). Visual and descriptive comparisons of the BMI and wellbeing distributions by risk
          factor suggest that differences in the outcome mean and variability are not always in the
          same direction.</p>
        <figure itemscope="" itemtype="http://schema.stenci.la/Figure" id="fig2" title="Figure 2.">
          <label data-itemprop="label">Figure 2.</label><img src="index.html.media/fig2.jpg" alt=""
            itemscope="" itemtype="http://schema.org/ImageObject">
          <figcaption>
            <h3 itemscope="" itemtype="http://schema.stenci.la/Heading"
              id="kernel-density-plots-for-body-mass-index-and-mental-wellbeing-stratified-by-risk-factor-group">
              Kernel density plots for body mass index and mental wellbeing, stratified by risk
              factor group.</h3>
            <p itemscope="" itemtype="http://schema.stenci.la/Paragraph">Note: CoV = coefficient of
              variation (SD/mean).</p>
          </figcaption>
        </figure>
        <p itemscope="" itemtype="http://schema.stenci.la/Paragraph">GAMLSS results for the binary
          risk factors are shown in <a href="#table1" itemscope=""
            itemtype="http://schema.stenci.la/Link">Tables 1 and 2</a>, with the results using the
          extra risk factor categories in<a href="#supp1" itemscope=""
            itemtype="http://schema.stenci.la/Link">Supplementary file 1</a>. Associations were
          similar in the unadjusted and mutually adjusted analyses, so the former are described
          below.</p>
        <table id="table1" itemscope="" itemtype="http://schema.org/Table">
          <caption><label data-itemprop="label">Table 1.</label>
            <div itemprop="caption">
              <h3 itemscope="" itemtype="http://schema.stenci.la/Heading"
                id="risk-factors-in-relation-to-body-mass-index-differences-in-mean-variability-and-skewness-estimated-by-gamlss-n--6007">
                Risk factors in relation to body mass index: differences in mean, variability and
                skewness estimated by GAMLSS (n = 6007).</h3>
            </div>
          </caption>
          <thead>
            <tr itemscope="" itemtype="http://schema.stenci.la/TableRow">
              <th itemscope="" itemtype="http://schema.stenci.la/TableCell">Risk factor</th>
              <th itemscope="" itemtype="http://schema.stenci.la/TableCell">%</th>
              <th itemscope="" itemtype="http://schema.stenci.la/TableCell">NO distribution</th>
              <th itemscope="" itemtype="http://schema.stenci.la/TableCell">BCCG distribution</th>
              <th itemscope="" itemtype="http://schema.stenci.la/TableCell"></th>
              <th itemscope="" itemtype="http://schema.stenci.la/TableCell"></th>
              <th itemscope="" itemtype="http://schema.stenci.la/TableCell"></th>
            </tr>
          </thead>
          <tbody>
            <tr itemscope="" itemtype="http://schema.stenci.la/TableRow">
              <td itemscope="" itemtype="http://schema.stenci.la/TableCell">Mean</td>
              <td itemscope="" itemtype="http://schema.stenci.la/TableCell">SD</td>
              <td itemscope="" itemtype="http://schema.stenci.la/TableCell">Median</td>
              <td itemscope="" itemtype="http://schema.stenci.la/TableCell">CoV</td>
              <td itemscope="" itemtype="http://schema.stenci.la/TableCell">Skewness<a
                  href="#table1fn1" itemscope="" itemtype="http://schema.stenci.la/Link">*</a></td>
              <td itemscope="" itemtype="http://schema.stenci.la/TableCell"></td>
              <td itemscope="" itemtype="http://schema.stenci.la/TableCell"></td>
            </tr>
            <tr itemscope="" itemtype="http://schema.stenci.la/TableRow">
              <td itemscope="" itemtype="http://schema.stenci.la/TableCell">Female (ref)</td>
              <td itemscope="" itemtype="http://schema.stenci.la/TableCell">52.4%</td>
              <td itemscope="" itemtype="http://schema.stenci.la/TableCell"><span
                  data-itemtype="http://schema.org/Number">28.1</span></td>
              <td itemscope="" itemtype="http://schema.stenci.la/TableCell"><span
                  data-itemtype="http://schema.org/Number">6.1</span></td>
              <td itemscope="" itemtype="http://schema.stenci.la/TableCell"><span
                  data-itemtype="http://schema.org/Number">26.9</span></td>
              <td itemscope="" itemtype="http://schema.stenci.la/TableCell"><span
                  data-itemtype="http://schema.org/Number">0.22</span></td>
              <td itemscope="" itemtype="http://schema.stenci.la/TableCell"><span
                  data-itemtype="http://schema.org/Number">1.1</span></td>
            </tr>
            <tr itemscope="" itemtype="http://schema.stenci.la/TableRow">
              <td itemscope="" itemtype="http://schema.stenci.la/TableCell">Male</td>
              <td itemscope="" itemtype="http://schema.stenci.la/TableCell">47.6%</td>
              <td itemscope="" itemtype="http://schema.stenci.la/TableCell"><span
                  data-itemtype="http://schema.org/Number">28.7</span></td>
              <td itemscope="" itemtype="http://schema.stenci.la/TableCell"><span
                  data-itemtype="http://schema.org/Number">4.6</span></td>
              <td itemscope="" itemtype="http://schema.stenci.la/TableCell"><span
                  data-itemtype="http://schema.org/Number">28.2</span></td>
              <td itemscope="" itemtype="http://schema.stenci.la/TableCell"><span
                  data-itemtype="http://schema.org/Number">0.16</span></td>
              <td itemscope="" itemtype="http://schema.stenci.la/TableCell"><span
                  data-itemtype="http://schema.org/Number">0.75</span></td>
            </tr>
            <tr itemscope="" itemtype="http://schema.stenci.la/TableRow">
              <td itemscope="" itemtype="http://schema.stenci.la/TableCell"> Unadjusted difference,
                % (SE)</td>
              <td itemscope="" itemtype="http://schema.stenci.la/TableCell"></td>
              <td itemscope="" itemtype="http://schema.stenci.la/TableCell">1.9 (0.5)</td>
              <td itemscope="" itemtype="http://schema.stenci.la/TableCell">–27.6 (1.8)</td>
              <td itemscope="" itemtype="http://schema.stenci.la/TableCell">4.1 (0.4)</td>
              <td itemscope="" itemtype="http://schema.stenci.la/TableCell">–23 (1.8)</td>
              <td itemscope="" itemtype="http://schema.stenci.la/TableCell">0.48 (0.11)</td>
            </tr>
            <tr itemscope="" itemtype="http://schema.stenci.la/TableRow">
              <td itemscope="" itemtype="http://schema.stenci.la/TableCell"> Adjusted<a
                  href="#table1fn2" itemscope="" itemtype="http://schema.stenci.la/Link"></a>
                difference, % (SE)</td>
              <td itemscope="" itemtype="http://schema.stenci.la/TableCell"></td>
              <td itemscope="" itemtype="http://schema.stenci.la/TableCell">2.2 (0.5)</td>
              <td itemscope="" itemtype="http://schema.stenci.la/TableCell">–27.4 (1.8)</td>
              <td itemscope="" itemtype="http://schema.stenci.la/TableCell">4.4 (0.4)</td>
              <td itemscope="" itemtype="http://schema.stenci.la/TableCell">–22.6 (1.8)</td>
              <td itemscope="" itemtype="http://schema.stenci.la/TableCell">0.54 (0.11)</td>
            </tr>
            <tr itemscope="" itemtype="http://schema.stenci.la/TableRow">
              <td itemscope="" itemtype="http://schema.stenci.la/TableCell"></td>
              <td itemscope="" itemtype="http://schema.stenci.la/TableCell"></td>
              <td itemscope="" itemtype="http://schema.stenci.la/TableCell"></td>
              <td itemscope="" itemtype="http://schema.stenci.la/TableCell"></td>
              <td itemscope="" itemtype="http://schema.stenci.la/TableCell"></td>
              <td itemscope="" itemtype="http://schema.stenci.la/TableCell"></td>
              <td itemscope="" itemtype="http://schema.stenci.la/TableCell"></td>
            </tr>
            <tr itemscope="" itemtype="http://schema.stenci.la/TableRow">
              <td itemscope="" itemtype="http://schema.stenci.la/TableCell">Non-manual (ref)</td>
              <td itemscope="" itemtype="http://schema.stenci.la/TableCell">36.3%</td>
              <td itemscope="" itemtype="http://schema.stenci.la/TableCell"><span
                  data-itemtype="http://schema.org/Number">27.7</span></td>
              <td itemscope="" itemtype="http://schema.stenci.la/TableCell"><span
                  data-itemtype="http://schema.org/Number">5.2</span></td>
              <td itemscope="" itemtype="http://schema.stenci.la/TableCell"><span
                  data-itemtype="http://schema.org/Number">27</span></td>
              <td itemscope="" itemtype="http://schema.stenci.la/TableCell"><span
                  data-itemtype="http://schema.org/Number">0.19</span></td>
              <td itemscope="" itemtype="http://schema.stenci.la/TableCell"><span
                  data-itemtype="http://schema.org/Number">1.15</span></td>
            </tr>
            <tr itemscope="" itemtype="http://schema.stenci.la/TableRow">
              <td itemscope="" itemtype="http://schema.stenci.la/TableCell">Manual social class</td>
              <td itemscope="" itemtype="http://schema.stenci.la/TableCell">63.7%</td>
              <td itemscope="" itemtype="http://schema.stenci.la/TableCell"><span
                  data-itemtype="http://schema.org/Number">28.8</span></td>
              <td itemscope="" itemtype="http://schema.stenci.la/TableCell"><span
                  data-itemtype="http://schema.org/Number">5.5</span></td>
              <td itemscope="" itemtype="http://schema.stenci.la/TableCell"><span
                  data-itemtype="http://schema.org/Number">28</span></td>
              <td itemscope="" itemtype="http://schema.stenci.la/TableCell"><span
                  data-itemtype="http://schema.org/Number">0.19</span></td>
              <td itemscope="" itemtype="http://schema.stenci.la/TableCell"><span
                  data-itemtype="http://schema.org/Number">0.9</span></td>
            </tr>
            <tr itemscope="" itemtype="http://schema.stenci.la/TableRow">
              <td itemscope="" itemtype="http://schema.stenci.la/TableCell"> Unadjusted difference,
                % (SE)</td>
              <td itemscope="" itemtype="http://schema.stenci.la/TableCell"></td>
              <td itemscope="" itemtype="http://schema.stenci.la/TableCell">4.0 (0.5)</td>
              <td itemscope="" itemtype="http://schema.stenci.la/TableCell">6.1 (1.9)</td>
              <td itemscope="" itemtype="http://schema.stenci.la/TableCell">4.4 (0.5)</td>
              <td itemscope="" itemtype="http://schema.stenci.la/TableCell">6 (1.9)</td>
              <td itemscope="" itemtype="http://schema.stenci.la/TableCell">0.39 (0.11)</td>
            </tr>
            <tr itemscope="" itemtype="http://schema.stenci.la/TableRow">
              <td itemscope="" itemtype="http://schema.stenci.la/TableCell"> Adjusted<a
                  href="#table1fn2" itemscope="" itemtype="http://schema.stenci.la/Link"></a>
                difference, % (SE)</td>
              <td itemscope="" itemtype="http://schema.stenci.la/TableCell"></td>
              <td itemscope="" itemtype="http://schema.stenci.la/TableCell">3.8 (0.5)</td>
              <td itemscope="" itemtype="http://schema.stenci.la/TableCell">5.5 (1.9)</td>
              <td itemscope="" itemtype="http://schema.stenci.la/TableCell">4.3 (0.4)</td>
              <td itemscope="" itemtype="http://schema.stenci.la/TableCell">5.6 (1.9)</td>
              <td itemscope="" itemtype="http://schema.stenci.la/TableCell">0.40 (0.12)</td>
            </tr>
            <tr itemscope="" itemtype="http://schema.stenci.la/TableRow">
              <td itemscope="" itemtype="http://schema.stenci.la/TableCell"></td>
              <td itemscope="" itemtype="http://schema.stenci.la/TableCell"></td>
              <td itemscope="" itemtype="http://schema.stenci.la/TableCell"></td>
              <td itemscope="" itemtype="http://schema.stenci.la/TableCell"></td>
              <td itemscope="" itemtype="http://schema.stenci.la/TableCell"></td>
              <td itemscope="" itemtype="http://schema.stenci.la/TableCell"></td>
              <td itemscope="" itemtype="http://schema.stenci.la/TableCell"></td>
            </tr>
            <tr itemscope="" itemtype="http://schema.stenci.la/TableRow">
              <td itemscope="" itemtype="http://schema.stenci.la/TableCell">Physically active (ref)
              </td>
              <td itemscope="" itemtype="http://schema.stenci.la/TableCell">73%</td>
              <td itemscope="" itemtype="http://schema.stenci.la/TableCell"><span
                  data-itemtype="http://schema.org/Number">28.1</span></td>
              <td itemscope="" itemtype="http://schema.stenci.la/TableCell"><span
                  data-itemtype="http://schema.org/Number">5.2</span></td>
              <td itemscope="" itemtype="http://schema.stenci.la/TableCell"><span
                  data-itemtype="http://schema.org/Number">27.4</span></td>
              <td itemscope="" itemtype="http://schema.stenci.la/TableCell"><span
                  data-itemtype="http://schema.org/Number">0.19</span></td>
              <td itemscope="" itemtype="http://schema.stenci.la/TableCell"><span
                  data-itemtype="http://schema.org/Number">0.97</span></td>
            </tr>
            <tr itemscope="" itemtype="http://schema.stenci.la/TableRow">
              <td itemscope="" itemtype="http://schema.stenci.la/TableCell">Inactive</td>
              <td itemscope="" itemtype="http://schema.stenci.la/TableCell">27%</td>
              <td itemscope="" itemtype="http://schema.stenci.la/TableCell"><span
                  data-itemtype="http://schema.org/Number">29.1</span></td>
              <td itemscope="" itemtype="http://schema.stenci.la/TableCell"><span
                  data-itemtype="http://schema.org/Number">6</span></td>
              <td itemscope="" itemtype="http://schema.stenci.la/TableCell"><span
                  data-itemtype="http://schema.org/Number">28.3</span></td>
              <td itemscope="" itemtype="http://schema.stenci.la/TableCell"><span
                  data-itemtype="http://schema.org/Number">0.21</span></td>
              <td itemscope="" itemtype="http://schema.stenci.la/TableCell"><span
                  data-itemtype="http://schema.org/Number">0.94</span></td>
            </tr>
            <tr itemscope="" itemtype="http://schema.stenci.la/TableRow">
              <td itemscope="" itemtype="http://schema.stenci.la/TableCell"> Unadjusted difference,
                % (SE)</td>
              <td itemscope="" itemtype="http://schema.stenci.la/TableCell"></td>
              <td itemscope="" itemtype="http://schema.stenci.la/TableCell">3.3 (0.6)</td>
              <td itemscope="" itemtype="http://schema.stenci.la/TableCell">13.5 (2.1)</td>
              <td itemscope="" itemtype="http://schema.stenci.la/TableCell">2.9 (0.5)</td>
              <td itemscope="" itemtype="http://schema.stenci.la/TableCell">10.4 (2.1)</td>
              <td itemscope="" itemtype="http://schema.stenci.la/TableCell">0.08 (0.12)</td>
            </tr>
            <tr itemscope="" itemtype="http://schema.stenci.la/TableRow">
              <td itemscope="" itemtype="http://schema.stenci.la/TableCell"> Adjusted<a
                  href="#table1fn2" itemscope="" itemtype="http://schema.stenci.la/Link"></a>
                difference, % (SE)</td>
              <td itemscope="" itemtype="http://schema.stenci.la/TableCell"></td>
              <td itemscope="" itemtype="http://schema.stenci.la/TableCell">3.3 (0.6)</td>
              <td itemscope="" itemtype="http://schema.stenci.la/TableCell">12.1 (2.1)</td>
              <td itemscope="" itemtype="http://schema.stenci.la/TableCell">3.1 (0.5)</td>
              <td itemscope="" itemtype="http://schema.stenci.la/TableCell">9.3 (2.1)</td>
              <td itemscope="" itemtype="http://schema.stenci.la/TableCell">0.12 (0.12)</td>
            </tr>
          </tbody>
        </table>
        <table id="table2" itemscope="" itemtype="http://schema.org/Table">
          <caption><label data-itemprop="label">Table 2.</label>
            <div itemprop="caption">
              <h3 itemscope="" itemtype="http://schema.stenci.la/Heading"
                id="risk-factors-in-relation-to-mental-wellbeing-wemwbs-differences-in-mean-variability-and-skewness-estimated-by-gamlss-n--7104">
                Risk factors in relation to mental wellbeing (WEMWBS): differences in mean,
                variability and skewness estimated by GAMLSS (n = 7,104).</h3>
            </div>
          </caption>
          <thead>
            <tr itemscope="" itemtype="http://schema.stenci.la/TableRow">
              <th itemscope="" itemtype="http://schema.stenci.la/TableCell">Risk factor</th>
              <th itemscope="" itemtype="http://schema.stenci.la/TableCell">%</th>
              <th itemscope="" itemtype="http://schema.stenci.la/TableCell">NO distribution</th>
              <th itemscope="" itemtype="http://schema.stenci.la/TableCell">BCCG distribution</th>
              <th itemscope="" itemtype="http://schema.stenci.la/TableCell"></th>
              <th itemscope="" itemtype="http://schema.stenci.la/TableCell"></th>
              <th itemscope="" itemtype="http://schema.stenci.la/TableCell"></th>
            </tr>
          </thead>
          <tbody>
            <tr itemscope="" itemtype="http://schema.stenci.la/TableRow">
              <td itemscope="" itemtype="http://schema.stenci.la/TableCell">Mean</td>
              <td itemscope="" itemtype="http://schema.stenci.la/TableCell">SD</td>
              <td itemscope="" itemtype="http://schema.stenci.la/TableCell">Median</td>
              <td itemscope="" itemtype="http://schema.stenci.la/TableCell">COV</td>
              <td itemscope="" itemtype="http://schema.stenci.la/TableCell">Skewness<a
                  href="#table2fn1" itemscope="" itemtype="http://schema.stenci.la/Link">*</a></td>
              <td itemscope="" itemtype="http://schema.stenci.la/TableCell"></td>
              <td itemscope="" itemtype="http://schema.stenci.la/TableCell"></td>
            </tr>
            <tr itemscope="" itemtype="http://schema.stenci.la/TableRow">
              <td itemscope="" itemtype="http://schema.stenci.la/TableCell">Female (ref)</td>
              <td itemscope="" itemtype="http://schema.stenci.la/TableCell">52.8%</td>
              <td itemscope="" itemtype="http://schema.stenci.la/TableCell"><span
                  data-itemtype="http://schema.org/Number">49.2</span></td>
              <td itemscope="" itemtype="http://schema.stenci.la/TableCell"><span
                  data-itemtype="http://schema.org/Number">8.5</span></td>
              <td itemscope="" itemtype="http://schema.stenci.la/TableCell"><span
                  data-itemtype="http://schema.org/Number">50</span></td>
              <td itemscope="" itemtype="http://schema.stenci.la/TableCell"><span
                  data-itemtype="http://schema.org/Number">0.17</span></td>
              <td itemscope="" itemtype="http://schema.stenci.la/TableCell">–0.41</td>
            </tr>
            <tr itemscope="" itemtype="http://schema.stenci.la/TableRow">
              <td itemscope="" itemtype="http://schema.stenci.la/TableCell">Male</td>
              <td itemscope="" itemtype="http://schema.stenci.la/TableCell">47.2%</td>
              <td itemscope="" itemtype="http://schema.stenci.la/TableCell"><span
                  data-itemtype="http://schema.org/Number">49.1</span></td>
              <td itemscope="" itemtype="http://schema.stenci.la/TableCell"><span
                  data-itemtype="http://schema.org/Number">8.2</span></td>
              <td itemscope="" itemtype="http://schema.stenci.la/TableCell"><span
                  data-itemtype="http://schema.org/Number">50</span></td>
              <td itemscope="" itemtype="http://schema.stenci.la/TableCell"><span
                  data-itemtype="http://schema.org/Number">0.17</span></td>
              <td itemscope="" itemtype="http://schema.stenci.la/TableCell">–0.40</td>
            </tr>
            <tr itemscope="" itemtype="http://schema.stenci.la/TableRow">
              <td itemscope="" itemtype="http://schema.stenci.la/TableCell"> Unadjusted difference,
                % (SE)</td>
              <td itemscope="" itemtype="http://schema.stenci.la/TableCell"></td>
              <td itemscope="" itemtype="http://schema.stenci.la/TableCell">–0.2 (0.4)</td>
              <td itemscope="" itemtype="http://schema.stenci.la/TableCell">–3.9 (1.7)</td>
              <td itemscope="" itemtype="http://schema.stenci.la/TableCell">–0.3 (0.4)</td>
              <td itemscope="" itemtype="http://schema.stenci.la/TableCell">–3.5 (1.7)</td>
              <td itemscope="" itemtype="http://schema.stenci.la/TableCell">0.02 (0.11)</td>
            </tr>
            <tr itemscope="" itemtype="http://schema.stenci.la/TableRow">
              <td itemscope="" itemtype="http://schema.stenci.la/TableCell"> Adjusted<a
                  href="#table2fn2" itemscope="" itemtype="http://schema.stenci.la/Link"></a>
                difference, % (SE)</td>
              <td itemscope="" itemtype="http://schema.stenci.la/TableCell"></td>
              <td itemscope="" itemtype="http://schema.stenci.la/TableCell">–0.6 (0.4)</td>
              <td itemscope="" itemtype="http://schema.stenci.la/TableCell">–3.6 (1.7)</td>
              <td itemscope="" itemtype="http://schema.stenci.la/TableCell">–0.7 (0.4)</td>
              <td itemscope="" itemtype="http://schema.stenci.la/TableCell">–2.6 (1.7)</td>
              <td itemscope="" itemtype="http://schema.stenci.la/TableCell">0.00 (0.11)</td>
            </tr>
            <tr itemscope="" itemtype="http://schema.stenci.la/TableRow">
              <td itemscope="" itemtype="http://schema.stenci.la/TableCell"></td>
              <td itemscope="" itemtype="http://schema.stenci.la/TableCell"></td>
              <td itemscope="" itemtype="http://schema.stenci.la/TableCell"></td>
              <td itemscope="" itemtype="http://schema.stenci.la/TableCell"></td>
              <td itemscope="" itemtype="http://schema.stenci.la/TableCell"></td>
              <td itemscope="" itemtype="http://schema.stenci.la/TableCell"></td>
              <td itemscope="" itemtype="http://schema.stenci.la/TableCell"></td>
            </tr>
            <tr itemscope="" itemtype="http://schema.stenci.la/TableRow">
              <td itemscope="" itemtype="http://schema.stenci.la/TableCell">Non-manual (ref)</td>
              <td itemscope="" itemtype="http://schema.stenci.la/TableCell">34.8%</td>
              <td itemscope="" itemtype="http://schema.stenci.la/TableCell"><span
                  data-itemtype="http://schema.org/Number">50.1</span></td>
              <td itemscope="" itemtype="http://schema.stenci.la/TableCell"><span
                  data-itemtype="http://schema.org/Number">7.9</span></td>
              <td itemscope="" itemtype="http://schema.stenci.la/TableCell"><span
                  data-itemtype="http://schema.org/Number">51</span></td>
              <td itemscope="" itemtype="http://schema.stenci.la/TableCell"><span
                  data-itemtype="http://schema.org/Number">0.16</span></td>
              <td itemscope="" itemtype="http://schema.stenci.la/TableCell">–0.45</td>
            </tr>
            <tr itemscope="" itemtype="http://schema.stenci.la/TableRow">
              <td itemscope="" itemtype="http://schema.stenci.la/TableCell">Manual social class</td>
              <td itemscope="" itemtype="http://schema.stenci.la/TableCell">65.2%</td>
              <td itemscope="" itemtype="http://schema.stenci.la/TableCell"><span
                  data-itemtype="http://schema.org/Number">48.7</span></td>
              <td itemscope="" itemtype="http://schema.stenci.la/TableCell"><span
                  data-itemtype="http://schema.org/Number">8.5</span></td>
              <td itemscope="" itemtype="http://schema.stenci.la/TableCell"><span
                  data-itemtype="http://schema.org/Number">49</span></td>
              <td itemscope="" itemtype="http://schema.stenci.la/TableCell"><span
                  data-itemtype="http://schema.org/Number">0.17</span></td>
              <td itemscope="" itemtype="http://schema.stenci.la/TableCell">–0.37</td>
            </tr>
            <tr itemscope="" itemtype="http://schema.stenci.la/TableRow">
              <td itemscope="" itemtype="http://schema.stenci.la/TableCell"> Unadjusted difference,
                % (SE)</td>
              <td itemscope="" itemtype="http://schema.stenci.la/TableCell"></td>
              <td itemscope="" itemtype="http://schema.stenci.la/TableCell">–2.8 (0.4)</td>
              <td itemscope="" itemtype="http://schema.stenci.la/TableCell">7.2 (1.8)</td>
              <td itemscope="" itemtype="http://schema.stenci.la/TableCell">–2.9 (0.4)</td>
              <td itemscope="" itemtype="http://schema.stenci.la/TableCell">10.9 (1.8)</td>
              <td itemscope="" itemtype="http://schema.stenci.la/TableCell">–0.20 (0.12)</td>
            </tr>
            <tr itemscope="" itemtype="http://schema.stenci.la/TableRow">
              <td itemscope="" itemtype="http://schema.stenci.la/TableCell"> Adjusted<a
                  href="#table2fn2" itemscope="" itemtype="http://schema.stenci.la/Link"></a>
                difference, % (SE)</td>
              <td itemscope="" itemtype="http://schema.stenci.la/TableCell"></td>
              <td itemscope="" itemtype="http://schema.stenci.la/TableCell">–2.5 (0.4)</td>
              <td itemscope="" itemtype="http://schema.stenci.la/TableCell">6.0 (1.8)</td>
              <td itemscope="" itemtype="http://schema.stenci.la/TableCell">–2.7 (0.4)</td>
              <td itemscope="" itemtype="http://schema.stenci.la/TableCell">9.8 (1.8)</td>
              <td itemscope="" itemtype="http://schema.stenci.la/TableCell">–0.24 (0.12)</td>
            </tr>
            <tr itemscope="" itemtype="http://schema.stenci.la/TableRow">
              <td itemscope="" itemtype="http://schema.stenci.la/TableCell"></td>
              <td itemscope="" itemtype="http://schema.stenci.la/TableCell"></td>
              <td itemscope="" itemtype="http://schema.stenci.la/TableCell"></td>
              <td itemscope="" itemtype="http://schema.stenci.la/TableCell"></td>
              <td itemscope="" itemtype="http://schema.stenci.la/TableCell"></td>
              <td itemscope="" itemtype="http://schema.stenci.la/TableCell"></td>
              <td itemscope="" itemtype="http://schema.stenci.la/TableCell"></td>
            </tr>
            <tr itemscope="" itemtype="http://schema.stenci.la/TableRow">
              <td itemscope="" itemtype="http://schema.stenci.la/TableCell">Physically active (ref)
              </td>
              <td itemscope="" itemtype="http://schema.stenci.la/TableCell">72.4%</td>
              <td itemscope="" itemtype="http://schema.stenci.la/TableCell"><span
                  data-itemtype="http://schema.org/Number">49.9</span></td>
              <td itemscope="" itemtype="http://schema.stenci.la/TableCell"><span
                  data-itemtype="http://schema.org/Number">8</span></td>
              <td itemscope="" itemtype="http://schema.stenci.la/TableCell"><span
                  data-itemtype="http://schema.org/Number">51</span></td>
              <td itemscope="" itemtype="http://schema.stenci.la/TableCell"><span
                  data-itemtype="http://schema.org/Number">0.16</span></td>
              <td itemscope="" itemtype="http://schema.stenci.la/TableCell">–0.38</td>
            </tr>
            <tr itemscope="" itemtype="http://schema.stenci.la/TableRow">
              <td itemscope="" itemtype="http://schema.stenci.la/TableCell">Inactive</td>
              <td itemscope="" itemtype="http://schema.stenci.la/TableCell">27.6%</td>
              <td itemscope="" itemtype="http://schema.stenci.la/TableCell"><span
                  data-itemtype="http://schema.org/Number">47.3</span></td>
              <td itemscope="" itemtype="http://schema.stenci.la/TableCell"><span
                  data-itemtype="http://schema.org/Number">8.9</span></td>
              <td itemscope="" itemtype="http://schema.stenci.la/TableCell"><span
                  data-itemtype="http://schema.org/Number">48</span></td>
              <td itemscope="" itemtype="http://schema.stenci.la/TableCell"><span
                  data-itemtype="http://schema.org/Number">0.19</span></td>
              <td itemscope="" itemtype="http://schema.stenci.la/TableCell">–0.36</td>
            </tr>
            <tr itemscope="" itemtype="http://schema.stenci.la/TableRow">
              <td itemscope="" itemtype="http://schema.stenci.la/TableCell"> Unadjusted difference,
                % (SE)</td>
              <td itemscope="" itemtype="http://schema.stenci.la/TableCell"></td>
              <td itemscope="" itemtype="http://schema.stenci.la/TableCell">–5.3 (0.5)</td>
              <td itemscope="" itemtype="http://schema.stenci.la/TableCell">10.9 (1.9)</td>
              <td itemscope="" itemtype="http://schema.stenci.la/TableCell">–5.2 (0.4)</td>
              <td itemscope="" itemtype="http://schema.stenci.la/TableCell">16.2 (1.9)</td>
              <td itemscope="" itemtype="http://schema.stenci.la/TableCell">–0.12 (0.12)</td>
            </tr>
            <tr itemscope="" itemtype="http://schema.stenci.la/TableRow">
              <td itemscope="" itemtype="http://schema.stenci.la/TableCell"> Adjusted<a
                  href="#table2fn2" itemscope="" itemtype="http://schema.stenci.la/Link"></a>
                difference, % (SE)</td>
              <td itemscope="" itemtype="http://schema.stenci.la/TableCell"></td>
              <td itemscope="" itemtype="http://schema.stenci.la/TableCell">–5.3 (0.5)</td>
              <td itemscope="" itemtype="http://schema.stenci.la/TableCell">9.9 (1.9)</td>
              <td itemscope="" itemtype="http://schema.stenci.la/TableCell">–5.1 (0.4)</td>
              <td itemscope="" itemtype="http://schema.stenci.la/TableCell">15.2 (1.9)</td>
              <td itemscope="" itemtype="http://schema.stenci.la/TableCell">–0.10 (0.12)</td>
            </tr>
          </tbody>
        </table>
        <h3 itemscope="" itemtype="http://schema.stenci.la/Heading" id="body-mass-index">Body mass
          index</h3>
        <p itemscope="" itemtype="http://schema.stenci.la/Paragraph">Males had higher mean BMI yet
          lower variability than females—see <a href="#fig2" itemscope=""
            itemtype="http://schema.stenci.la/Link">Figure 2</a> and <a href="#table1" itemscope=""
            itemtype="http://schema.stenci.la/Link">Table 1</a>. The SD for BMI was lower in males
          (4.6) than females (6.1) that is a 28% difference (difference in log(SD) *100). This
          matches the estimate obtained from GAMLSS—males had 27.6% (SE: 1.8%) less variability than
          females (<a href="#table1" itemscope="" itemtype="http://schema.stenci.la/Link">Table
            1</a>).</p>
        <p itemscope="" itemtype="http://schema.stenci.la/Paragraph">In contrast, lower social class
          and physical inactivity were both associated with higher mean BMI and higher BMI
          variability (<a href="#fig2" itemscope="" itemtype="http://schema.stenci.la/Link">Figure
            2</a> and <a href="#table1" itemscope="" itemtype="http://schema.stenci.la/Link">Table
            1</a>). Those from lower social class households had 4% (SE 0.5%) higher mean BMI than
          those from non-manual classes, and 6.1% (1.9%) more variability. Physically inactive
          participants had 3.3% (0.6%) higher mean BMI and 13.5% (2.1%) more variability.</p>
        <p itemscope="" itemtype="http://schema.stenci.la/Paragraph">The GAMLSS results were similar
          with the BCCG distribution rather than NO (<a href="#table1" itemscope=""
            itemtype="http://schema.stenci.la/Link">Table 1</a>). That is, risk factors associated
          with higher mean BMI and higher SD were also associated with higher median BMI and higher
          CoV. Male sex and lower social class were both associated with less right skewness of the
          BMI distribution; the Box-Cox power was 0.5 (0.1) higher in males and 0.4 (0.1) higher for
          manual social class. Physical activity was not associated with outcome skewness.</p>
        <h3 itemscope="" itemtype="http://schema.stenci.la/Heading"
          id="mental-wellbeing--warwick-edinburgh-mental-wellbeing-scale">Mental wellbeing –
          Warwick-Edinburgh mental wellbeing scale</h3>
        <p itemscope="" itemtype="http://schema.stenci.la/Paragraph">There was little evidence of
          sex differences in mean wellbeing, while males had marginally less variability than
          females by 3.9% (1.7%). Lower social class and physical inactivity were both associated
          with lower mean yet higher variability (<a href="#fig2" itemscope=""
            itemtype="http://schema.stenci.la/Link">Figure 2</a> and <a href="#table2" itemscope=""
            itemtype="http://schema.stenci.la/Link">Table 2</a>). Those from lower social class
          households had a 2.8% (0.4%) lower mean yet 7.2% (1.8%) higher variability. Physically
          inactive participants had 5.3% (0.5%) lower mean yet 10.9% (1.9%) higher variability.
          These findings were similar in mutually adjusted analyses (<a href="#table2" itemscope=""
            itemtype="http://schema.stenci.la/Link">Table 2</a>).</p>
        <p itemscope="" itemtype="http://schema.stenci.la/Paragraph">The results were similar with
          the BCCG distribution (<a href="#table2" itemscope=""
            itemtype="http://schema.stenci.la/Link">Table 2</a>). There was evidence suggesting that
          lower social class was associated with less skewness in the wellbeing distribution; sex
          and physical activity were not associated with outcome skewness.</p>
        <h3 itemscope="" itemtype="http://schema.stenci.la/Heading"
          id="comparison-with-quantile-regression-findings">Comparison with quantile regression
          findings</h3>
        <p itemscope="" itemtype="http://schema.stenci.la/Paragraph">For BMI, the associations of
          lower social class and physical inactivity were stronger at upper quantiles (<a
            href="#table3" itemscope="" itemtype="http://schema.stenci.la/Link">Table 3</a>; e.g.,
          manual social class had 3.7 (0.6) higher BMI at the the median, and 4.9 (0.7) at the
          75th); estimates at higher centiles were also estimated less precisely than at lower
          centiles (larger SE). In contrast sex differences were present at lower centiles but
          absent at the 75th centile. These findings corresponded with those from GAMLSS using BCCG,
          with all BMI centiles plotted by risk factor group (<a href="#fig3" itemscope=""
            itemtype="http://schema.stenci.la/Link">Figure 3</a>). This comparison highlights the
          utility of GAMLSS—risk factor differences in the mean, variability, and skewness can each
          be quantified and thus visually depicted.</p>
        <table id="table3" itemscope="" itemtype="http://schema.org/Table">
          <caption><label data-itemprop="label">Table 3.</label>
            <div itemprop="caption">
              <h4 itemscope="" itemtype="http://schema.stenci.la/Heading"
                id="risk-factors-in-relation-to-body-mass-index-bmi-and-mental-wellbeing-wemwbs-percentage-differences-at-multiple-points-of-the-outcome-distribution-estimated-by-quantile-regression">
                Risk factors in relation to body mass index (BMI) and mental wellbeing (WEMWBS):
                percentage differences at multiple points of the outcome distribution estimated by
                quantile regression.</h4>
            </div>
          </caption>
          <thead>
            <tr itemscope="" itemtype="http://schema.stenci.la/TableRow">
              <th itemscope="" itemtype="http://schema.stenci.la/TableCell">Outcome</th>
              <th itemscope="" itemtype="http://schema.stenci.la/TableCell">Risk factor</th>
              <th itemscope="" itemtype="http://schema.stenci.la/TableCell">25th centile</th>
              <th itemscope="" itemtype="http://schema.stenci.la/TableCell">50th centile</th>
              <th itemscope="" itemtype="http://schema.stenci.la/TableCell">75th centile</th>
            </tr>
          </thead>
          <tbody>
            <tr itemscope="" itemtype="http://schema.stenci.la/TableRow">
              <td itemscope="" itemtype="http://schema.stenci.la/TableCell">BMI @ Age 46</td>
              <td itemscope="" itemtype="http://schema.stenci.la/TableCell">Male vs female</td>
              <td itemscope="" itemtype="http://schema.stenci.la/TableCell">6.8 (0.5)</td>
              <td itemscope="" itemtype="http://schema.stenci.la/TableCell">4.5 (0.6)</td>
              <td itemscope="" itemtype="http://schema.stenci.la/TableCell">–0.8 (0.7)</td>
            </tr>
            <tr itemscope="" itemtype="http://schema.stenci.la/TableRow">
              <td itemscope="" itemtype="http://schema.stenci.la/TableCell">Father’s Class</td>
              <td itemscope="" itemtype="http://schema.stenci.la/TableCell">3.7 (0.6)</td>
              <td itemscope="" itemtype="http://schema.stenci.la/TableCell">3.7 (0.6)</td>
              <td itemscope="" itemtype="http://schema.stenci.la/TableCell">4.9 (0.7)</td>
              <td itemscope="" itemtype="http://schema.stenci.la/TableCell"></td>
            </tr>
            <tr itemscope="" itemtype="http://schema.stenci.la/TableRow">
              <td itemscope="" itemtype="http://schema.stenci.la/TableCell">Exercise Level</td>
              <td itemscope="" itemtype="http://schema.stenci.la/TableCell">1 (0.7)</td>
              <td itemscope="" itemtype="http://schema.stenci.la/TableCell">3 (0.7)</td>
              <td itemscope="" itemtype="http://schema.stenci.la/TableCell">4.3 (0.8)</td>
              <td itemscope="" itemtype="http://schema.stenci.la/TableCell"></td>
            </tr>
            <tr itemscope="" itemtype="http://schema.stenci.la/TableRow">
              <td itemscope="" itemtype="http://schema.stenci.la/TableCell">WEMWBS @ Age 42</td>
              <td itemscope="" itemtype="http://schema.stenci.la/TableCell">Sex</td>
              <td itemscope="" itemtype="http://schema.stenci.la/TableCell">0 (0.7)</td>
              <td itemscope="" itemtype="http://schema.stenci.la/TableCell">0 (0.5)</td>
              <td itemscope="" itemtype="http://schema.stenci.la/TableCell">0 (0.3)</td>
            </tr>
            <tr itemscope="" itemtype="http://schema.stenci.la/TableRow">
              <td itemscope="" itemtype="http://schema.stenci.la/TableCell">Father’s Class</td>
              <td itemscope="" itemtype="http://schema.stenci.la/TableCell">–4.5 (0.7)</td>
              <td itemscope="" itemtype="http://schema.stenci.la/TableCell">–4 (0.5)</td>
              <td itemscope="" itemtype="http://schema.stenci.la/TableCell">–1.8 (0.3)</td>
              <td itemscope="" itemtype="http://schema.stenci.la/TableCell"></td>
            </tr>
            <tr itemscope="" itemtype="http://schema.stenci.la/TableRow">
              <td itemscope="" itemtype="http://schema.stenci.la/TableCell">Exercise Level</td>
              <td itemscope="" itemtype="http://schema.stenci.la/TableCell">–6.9 (0.5)</td>
              <td itemscope="" itemtype="http://schema.stenci.la/TableCell">–6.1 (0.5)</td>
              <td itemscope="" itemtype="http://schema.stenci.la/TableCell">–1.8 (0.5)</td>
              <td itemscope="" itemtype="http://schema.stenci.la/TableCell"></td>
            </tr>
          </tbody>
        </table>
        <figure itemscope="" itemtype="http://schema.stenci.la/Figure" id="fig3" title="Figure 3.">
          <label data-itemprop="label">Figure 3.</label><img src="index.html.media/fig3.jpg" alt=""
            itemscope="" itemtype="http://schema.org/ImageObject">
          <figcaption>
            <h4 itemscope="" itemtype="http://schema.stenci.la/Heading"
              id="association-between-risk-factors-and-bmi-by-bmi-centile">Association between risk
              factors and BMI by BMI centile.</h4>
            <p itemscope="" itemtype="http://schema.stenci.la/Paragraph">Plotted lines are
              calculated using GAMLSS estimation results of the entire outcome distribution; points
              at the 25th, 50th, and 75th centiles are estimated using quantile regression models.
              Marginal effects show the differences in outcome between each risk group across the
              outcome distribution.</p>
          </figcaption>
        </figure>
        <p itemscope="" itemtype="http://schema.stenci.la/Paragraph">For WEMWBS, the associations of
          lower social class and physical inactivity were also stronger at lower quantiles (<a
            href="#table3" itemscope="" itemtype="http://schema.stenci.la/Link">Table 3</a>), yet
          had larger standard errors. Sex was not associated with WEMWBS at any centile. These
          findings corresponded with those from GAMLSS (<a href="#fig4" itemscope=""
            itemtype="http://schema.stenci.la/Link">Figure 4</a>).</p>
        <figure itemscope="" itemtype="http://schema.stenci.la/Figure" id="fig4" title="Figure 4.">
          <label data-itemprop="label">Figure 4.</label><img src="index.html.media/fig4.jpg" alt=""
            itemscope="" itemtype="http://schema.org/ImageObject">
          <figcaption>
            <h4 itemscope="" itemtype="http://schema.stenci.la/Heading"
              id="association-between-risk-factors-and-mental-wellbeing-wemwbs-by-centile">
              Association between risk factors and mental wellbeing (WEMWBS) by centile.</h4>
            <p itemscope="" itemtype="http://schema.stenci.la/Paragraph">Plotted lines are
              calculated using GAMLSS estimation results of the entire outcome distribution; points
              at the 25th, 50th, and 75th centiles are estimated using quantile regression models.
              Marginal effects show the differences in outcome between each risk group across the
              outcome distribution.</p>
          </figcaption>
        </figure>
        <h2 itemscope="" itemtype="http://schema.stenci.la/Heading" id="discussion">Discussion</h2>
        <p itemscope="" itemtype="http://schema.stenci.la/Paragraph">Using an underutilised
          analytical approach (GAMLSS), we present empirical evidence to support the idea that risk
          factors can relate to sizable differences in outcome variability, and even outcome
          skewness, in addition to differences in the outcome mean. Females had higher variability
          in BMI and mental wellbeing than males; lower social class and physical inactivity were
          each associated with higher variability in both BMI and mental wellbeing, despite having
          different directions of association with the mean (higher BMI yet lower mental wellbeing).
        </p>
        <p itemscope="" itemtype="http://schema.stenci.la/Paragraph">Our findings add to an emerging
          literature which has investigated associations between risk factors and outcome
          variability. Studies <span itemscope="" itemtype="http://schema.stenci.la/CiteGroup"><cite
              itemscope="" itemtype="http://schema.stenci.la/Cite"><a
                href="#bib51"><span>51</span><span>Sun et
                  al.</span><span>2020</span></a></cite><cite itemscope=""
              itemtype="http://schema.stenci.la/Cite"><a href="#bib34"><span>34</span><span>Nakagawa
                  et al.</span><span>2014</span></a></cite><cite itemscope=""
              itemtype="http://schema.stenci.la/Cite"><a href="#bib36"><span>36</span><span>Pitt et
                  al.</span><span>2020</span></a></cite><cite itemscope=""
              itemtype="http://schema.stenci.la/Cite"><a href="#bib20"><span>20</span><span>Hohberg
                  et al.</span><span>2020</span></a></cite><cite itemscope=""
              itemtype="http://schema.stenci.la/Cite"><a
                href="#bib45"><span>45</span><span>Silbersdorff and
                  Schneider</span><span>2019</span></a></cite><cite itemscope=""
              itemtype="http://schema.stenci.la/Cite"><a
                href="#bib44"><span>44</span><span>Silbersdorff et
                  al.</span><span>2018</span></a></cite><cite itemscope=""
              itemtype="http://schema.stenci.la/Cite"><a href="#bib5"><span>5</span><span>Beyerlein
                  et al.</span><span>2008</span></a></cite></span> have reported that risk factors
          associated with higher means are also associated with higher outcome variability. For
          example, <cite itemscope="" itemtype="http://schema.stenci.la/Cite"><a
              href="#bib5"><span>5</span><span>Beyerlein et al.</span><span>2008</span></a></cite>
          found that multiple risk factors for high childhood BMI (such as more frequent television
          viewing and greater rapid infant weight gain) were related to both higher mean BMI and
          greater variability in BMI. However, previous studies have not utilised multiple outcomes
          or nationally representative samples, and have not systematically considered explanations
          for such findings or their implications.</p>
        <p itemscope="" itemtype="http://schema.stenci.la/Paragraph">Our findings help to reconcile
          findings from GAMLSS with those using quantile regression <span itemscope=""
            itemtype="http://schema.stenci.la/CiteGroup"><cite itemscope=""
              itemtype="http://schema.stenci.la/Cite"><a href="#bib5"><span>5</span><span>Beyerlein
                  et al.</span><span>2008</span></a></cite><cite itemscope=""
              itemtype="http://schema.stenci.la/Cite"><a href="#bib3"><span>3</span><span>Bann et
                  al.</span><span>2020</span></a></cite><cite itemscope=""
              itemtype="http://schema.stenci.la/Cite"><a href="#bib19"><span>19</span><span>Green
                  and Rowe</span><span>2020</span></a></cite></span> which have reported stronger
          effect sizes for BMI risk factors at higher BMI centiles. This finding is both consistent
          with and helps explain the GAMLSS findings. For instance, lower social class and physical
          inactivity are related to higher BMI mean and variability, yet less BMI skewness; the net
          result is higher effect estimates at upper centiles which are less precisely estimated, as
          seen in quantile regression. While both analytical approaches have merit, GAMLSS has a
          number of attractive features for use in aetiological research: it enables each
          distribution moment to be separately investigated, and uses predetermined distribution
          families which enable computation of sparsely distributed variables.</p>
        <p itemscope="" itemtype="http://schema.stenci.la/Paragraph">Why are risk factors associated
          with differences in outcome variability? There are multiple possible explanations. First,
          risk factors may not be sufficient for an outcome to occur but rather only have a causal
          effect in the presence of other factors, for instance as posited in models such as the <em
            itemscope="" itemtype="http://schema.stenci.la/Emphasis">stress-diathesis</em> model of
          mental health <cite itemscope="" itemtype="http://schema.stenci.la/Cite"><a
              href="#bib59"><span>59</span><span>Zuckerman</span><span>1999</span></a></cite>. Such
          additional factors could also operate as effect modifiers which increase the strength of
          the risk factor. Factors such as genetic propensity to weight gain may for example modify
          the effect on weight gain of exposure to adverse socioeconomic circumstances <cite
            itemscope="" itemtype="http://schema.stenci.la/Cite"><a
              href="#bib54"><span>54</span><span>Tyrrell et al.</span><span>2017</span></a></cite>.
          Other environmental factors could operate similarly—such that the association between
          lower social class and higher BMI is weaker amongst those living in a local environment
          which is less ‘obesogenic’ (i.e. less conducive to physical inactivity and lower energy
          intake) <span itemscope="" itemtype="http://schema.stenci.la/CiteGroup"><cite itemscope=""
              itemtype="http://schema.stenci.la/Cite"><a
                href="#bib15"><span>15</span><span>Drewnowski et
                  al.</span><span>2007</span></a></cite><cite itemscope=""
              itemtype="http://schema.stenci.la/Cite"><a href="#bib47"><span>47</span><span>Stafford
                  et al.</span><span>2007</span></a></cite></span>. The net result of such divergent
          effects would be increased variability since the effects would range from zero to the
          upper bound of the effect. This explanation may also apply to mental wellbeing, given
          evidence for the myriad environmental <span itemscope=""
            itemtype="http://schema.stenci.la/CiteGroup"><cite itemscope=""
              itemtype="http://schema.stenci.la/Cite"><a href="#bib28"><span>28</span><span>Ludwig
                  et al.</span><span>2012</span></a></cite><cite itemscope=""
              itemtype="http://schema.stenci.la/Cite"><a href="#bib58"><span>58</span><span>Wood et
                  al.</span><span>2021</span></a></cite></span> and genetic determinants <span
            itemscope="" itemtype="http://schema.stenci.la/CiteGroup"><cite itemscope=""
              itemtype="http://schema.stenci.la/Cite"><a href="#bib27"><span>27</span><span>Luciano
                  et al.</span><span>2018</span></a></cite><cite itemscope=""
              itemtype="http://schema.stenci.la/Cite"><a href="#bib14"><span>14</span><span>Moor et
                  al.</span><span>2015</span></a></cite></span> which could modify the effects
          observed in the current study.</p>
        <p itemscope="" itemtype="http://schema.stenci.la/Paragraph">Alternatively, between-person
          differences in confounding and/or measurement error may also lead to risk factors being
          associated with outcome variability. For example, in the present study physical activity
          was measured via a single item capturing reported activity of a moderate-vigorous
          intensity for at least 30 min per day; this is an imperfect reflection of the underlying
          exposure which may have a causal effect (e.g. total energy expenditure [across all
          intensities of activity] in the case of adiposity; <cite itemscope=""
            itemtype="http://schema.stenci.la/Cite"><a href="#bib1"><span>1</span><span>Bann et
                al.</span><span>2014</span></a></cite> or time spent in specific activities
          conducive to wellbeing in the case of mental wellbeing <cite itemscope=""
            itemtype="http://schema.stenci.la/Cite"><a href="#bib9"><span>9</span><span>Black et
                al.</span><span>2015</span></a></cite>). The net result would be higher variability
          in those reporting higher physical activity levels. A related issue is the extent to which
          the exposure captures the same ‘dose’ across participants in a given study. The physical
          activity measure used here counted the number of days that bouts of activity lasted at
          least 30 min; this likely reflects substantial variability in the level of exercise
          actually undertaken, thus leading to greater differences in outcome variability. This
          could partly explain the associations of lower social class with greater outcome
          variability, since social class is one dimension of socioeconomic position, such that
          there may be substantial between-person variation in other dimensions (e.g. parental
          education, income and/or wealth <span itemscope=""
            itemtype="http://schema.stenci.la/CiteGroup"><cite itemscope=""
              itemtype="http://schema.stenci.la/Cite"><a href="#bib32"><span>32</span><span>Moulton
                  et al.</span><span>2021</span></a></cite><cite itemscope=""
              itemtype="http://schema.stenci.la/Cite"><a
                href="#bib18"><span>18</span><span>Galobardes et
                  al.</span><span>2006</span></a></cite></span>) which may each influence outcomes,
          leading to greater variability.</p>
        <p itemscope="" itemtype="http://schema.stenci.la/Paragraph">The study highlights the fact
          that analyses by GAMLSS and quantile regression lead to similar results at the selected
          quantiles of the outcome distribution—see <a href="#fig3" itemscope=""
            itemtype="http://schema.stenci.la/Link">Figures 3</a> and <a href="#fig4" itemscope=""
            itemtype="http://schema.stenci.la/Link"><span
              data-itemtype="http://schema.org/Number">4</span></a>. However GAMLSS, by analysing
          the whole distribution, can in some cases provide more efficient estimates of the
          quantiles. Compare for example the standard errors of the median as obtained by the BCCG
          distribution (<a href="#table2" itemscope=""
            itemtype="http://schema.stenci.la/Link">Tables 2 and 3</a>) and quantile regression (<a
            href="#table3" itemscope="" itemtype="http://schema.stenci.la/Link">Table 3</a>); the
          GAMLSS standard errors are smaller.</p>
        <h3 itemscope="" itemtype="http://schema.stenci.la/Heading" id="strengths-and-limitations">
          Strengths and limitations</h3>
        <p itemscope="" itemtype="http://schema.stenci.la/Paragraph">Strengths of this study include
          the analytical approach used (GAMLSS) to empirically investigate differences in outcome
          variability. While differences in variability can be informed by descriptive comparison
          (e.g. comparing standard deviations), GAMLSS additionally enables computation of estimates
          of precision and incorporates multivariable specifications (e.g. confounder or mediator
          adjustment; and inclusion of interaction terms). The use of the 1970 birth cohort data is
          an additional strength, enabling investigation of multiple risk factors and two largely
          orthogonal yet important continuous health outcomes. The national representation of this
          cohort is also advantageous—highly distorted sample selection can bias conventional
          epidemiological results (i.e. mean differences in outcomes) <cite itemscope=""
            itemtype="http://schema.stenci.la/Cite"><a href="#bib33"><span>33</span><span>Munafò et
                al.</span><span>2018</span></a></cite>, and may also bias comparisons of outcome
          variability.</p>
        <p itemscope="" itemtype="http://schema.stenci.la/Paragraph">The study also has limitations.
          As in all observational studies, causal inference is challenging despite the use of
          longitudinal data. Associations of social class at birth with outcomes for example could
          be explained by unmeasured confounding—this may include factors such as parental mental
          health. This is challenging to falsify empirically owing to a lack of such data collected
          before birth. In contrast, sex is randomly assigned at birth, and thus its associations
          with outcomes are unlikely to be confounded. However, sex differences in reporting may
          bias associations with mental wellbeing. Physical activity and mental wellbeing were
          ascertained at broadly the same age, so that associations between the two could be
          explained by reverse causality; existing evidence appears to suggest bi-directionality of
          links between physical activity and both outcomes <span itemscope=""
            itemtype="http://schema.stenci.la/CiteGroup"><cite itemscope=""
              itemtype="http://schema.stenci.la/Cite"><a href="#bib35"><span>35</span><span>Pinto
                  Pereira et al.</span><span>2014</span></a></cite><cite itemscope=""
              itemtype="http://schema.stenci.la/Cite"><a href="#bib4"><span>4</span><span>Barone
                  Gibbs et al.</span><span>2020</span></a></cite></span>. Finally, attrition led to
          lower power to precisely estimate smaller effect sizes (e.g. gender differences in mental
          wellbeing) or confirm null effects. Such attribution could potentially bias
          associations—those in worse health and adverse socioeconomic circumstances are
          disproportionately lost to follow-up <span itemscope=""
            itemtype="http://schema.stenci.la/CiteGroup"><cite itemscope=""
              itemtype="http://schema.stenci.la/Cite"><a href="#bib30"><span>30</span><span>Mostafa
                  and Wiggins</span><span>2015</span></a></cite><cite itemscope=""
              itemtype="http://schema.stenci.la/Cite"><a href="#bib31"><span>31</span><span>Mostafa
                  et al.</span><span>2021</span></a></cite></span>. The focus of principled
          approaches to handle missing data in epidemiology has been on the main parameter of
          interest—typically beta coefficients in linear regression models—and further empirical
          work is required to investigate the potential implications of (non-random) missingness for
          the variability and other moments of the outcome distribution.</p>
        <h3 itemscope="" itemtype="http://schema.stenci.la/Heading" id="potential-implications">
          Potential implications</h3>
        <p itemscope="" itemtype="http://schema.stenci.la/Paragraph">This study used an
          underutilised approach to empirically investigate associations between risk factors and
          outcome variability in a single cohort study. Thus, our findings require replication and
          extension in other datasets across other risk factors and health outcomes. Future studies
          should also seek to explain their findings, and where possible falsify potential
          explanations. Understanding how risk factors relate to and/or cause differences in outcome
          variability is not a standard part of epidemiological training, and it entails additional
          analytical and conceptual complexity. Thus, with greater application of these tools an
          emerging consensus on best practice should develop. In the first instance, we recommend
          both descriptive and formal investigation, and that analysts carefully consider the use of
          both absolute (e.g. SD) and relative (e.g. CoV) differences in variability. Since the CoV
          is fractional standard deviation (e.g. SD/mean or log SD), its suitability of use depends
          on the a priori anticipated relationship between the mean and variance.</p>
        <p itemscope="" itemtype="http://schema.stenci.la/Paragraph">In the context of randomised
          controlled trials, the finding of variability in treatment effects between individuals has
          been used to justify individualised approaches to treatment (personalised medicine). It is
          beyond the scope of the current article to discuss the tractability of this for complex
          outcomes in which treatment effects are unpredictable <cite itemscope=""
            itemtype="http://schema.stenci.la/Cite"><a href="#bib13"><span>13</span><span>Davey
                Smith</span><span>2011</span></a></cite>. Trials are designed typically to detect
          only mean differences in outcomes <cite itemscope=""
            itemtype="http://schema.stenci.la/Cite"><a
              href="#bib43"><span>43</span><span>Senn</span><span>2016</span></a></cite>;
          nevertheless, additionally presenting outcome variability before and after treatment would
          be helpful to better appraise intervention effects <cite itemscope=""
            itemtype="http://schema.stenci.la/Cite"><a
              href="#bib50"><span>50</span><span>Subramanian et
                al.</span><span>2018</span></a></cite>. GAMLSS provides a useful framework with
          which to formally investigate this, even where the homoscedasticity assumption does not
          hold (i.e. where risk factors or treatment groups differ in their outcome variance). Where
          there are multiple potential efficacious interventions, further studies could meta-analyse
          existing trials to identify the types of intervention which additionally reduce outcome
          variability.</p>
        <h3 itemscope="" itemtype="http://schema.stenci.la/Heading" id="conclusion">Conclusion</h3>
        <p itemscope="" itemtype="http://schema.stenci.la/Paragraph">We provide empirical support
          for the notion that risk factors or interventions can either reduce or increase
          variability in health outcomes. This finding is consistent with results from quantile
          regression analysis where a risk factor vs outcome association is stronger (or weaker) at
          higher outcome centiles. Such findings may be explained by heterogeneity in the causal
          effect of each exposure, by the influence of other (typically unmeasured) variables,
          and/or by measurement error. This underutilised approach to the analysis of continuously
          distributed outcomes may have broader utility in epidemiological, medical, and
          psychological sciences. Our tutorial and syntax content is designed to facilitate this.
        </p>
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