MVPA activities in Beijing school students by gender and grade.

<p>Abbreviations: MVPA, moderate to vigorous physical activity; IQR = interquartile range, computed for only those reporting any (>0 min).</p><p>^a Descriptive statistics were calculated for total reported time in MVPA (sum of in-school, and outside school). Descriptive statistics herein are therefore presented as the proportion reporting any defined MVPA and the median and interquartile range (IQR) of distribution of time (min/week) for those reporting any of MVPA. ^a gender difference regardless of grade</p><p>^b grade difference within gender</p><p>^c gender difference within grade.</p><p>* <i>P</i><0.05</p><p>** <i>P</i><0.01</p><p>*** <i>P</i><0.001</p><p>MVPA activities in Beijing school students by gender and grade.