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Fig. 2 | BMC Public Health

Fig. 2

From: Age, period and cohort effects and the predictors of physical activity and sedentary behaviour among Chinese children, from 2004 to 2011

Fig. 2

Age trends in mean physical activity among girls in the CHNS by baseline age groups (MET-hrs/wk). Notes: Points represent PA level of female children at the mean age for the age group in each survey year (2004, 2006, 2009, 2011). The vertical dotted line illustrates the difference in estimated PA level for a 13-year old girl in 2004 vs 13-year old girl in 2006 vs a 13-year old girl in 2009 (cohort effect)

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