1<p>For a test of linear trend when a variable that represented the median value of each quartile was introduced into a linear regression model as a continuous predictor (Wald test).</p>2<p>According to the World Health Organization growth reference for children 5–19 years <a href="http://www.plosone.org/article/info:doi/10.1371/journal.pone.0062587#pone.0062587-deOnis2" target="_blank">[30]</a>.</p>3<p>Values are means ± SD.</p>4<p>Values are means ± SE.</p>5<p>Adjusted for baseline age and socioeconomic status.</p>6<p>Age-standardized using the LMS method with data for boys 5–16 years of age in NHANES III <a href="http://www.plosone.org/article/info:doi/10.1371/journal.pone.0062587#pone.0062587-1" target="_blank">[32]</a>.</p>7<p>Subscapular-to-tricipital skinfold thickness ratio.</p
