Modeling the Effect of Physical Activity on Obesity in China: Evidence from the Longitudinal China Health and Nutrition Study 1989-2011.

Again, both the static fixed effects and random effects regressions give the positive and insignificant coefficients for gender dummy, while both dynamic regressions provide positive and highly significant estimates.

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However, some other longitudinal studies using dynamic models also found an insignificant or weakly significant association between education and BMI [ 1 ].

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The time doing PA in school also roughly holds an increasing trend from 3.75 h in 1997 to 6.43 h in 2011. ‘Participating in PA’ is a dummy variable, and subsequently the mean of it, in fact, presents the proportion of children usually participating in the physical exercises.

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