Fig. 2
Predicted occupational, domestic, travel, and leisure PA, China Health and Nutrition Survey 1991-2009a. aOccupational, domestic, leisure, and travel PA in men (top row) and women (bottom row) predicted from sex-stratified, zero-inflated negative binomial models according to urbanicity (year-specific tertiles of low, medium, and high urbanicity) at medium income. Main exposure variables were year, urbanicity, income, the interaction between urbanicity and income, and the interaction between urbanicity, income and year. Models additionally control for region of China (North, Central, South) and age (ages 18-35y, 35-55y, 55-75y). Abbreviations: PA, physical activity