![]() ![]() For both genders, we found non-linear decreases in PA with age over time. ![]() The mean age of the sample rose from 41.31 to 50.8 years and PA decreased from 427.75 ± 264.35 MET hours per week (MET-hr/wk) in 1991 to 245.99 ± 206.65 MET-hr/wk in 2011, with much steeper declines for women compared to men. Analyses for adult (≥20y) males ( n = 29,343) and females ( n = 31,094) was conducted to explicitly assess differences in PA due to age vs period effects, and implicitly assess differences by cohorts due to the period-specific experiences across individuals of varying ages. Age, individual characteristics, household size, asset ownership, urbanization were included as covariates. The outcomes of interest are metabolic equivalent of task (MET) hours per week from work and domestic activities. We used data from the China Health and Nutrition Survey (CHNS) between 19 (20 years). To date no work has differentiated the effects of age, period, and cohort on physical activity (PA) among Chinese adults, while also considering biological, behavioral, economic, and environmental factors over time.
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