Table 3.

Basic information regarding physical activity exposure.

	Mean (SD), (min/week)	IQR, (min/week)	Physical activity group, n (%)
			Insufficient physical activity	Sufficient physical activity
Total	152.5 (294.2)	240.0	109,691 (85.2)	19,068 (14.8)
Rural	119.0 (264.5)	150.0	61,733 (90.0)	6,865 (10.0)
Urban	190.4 *(320.6)	300.0	47,958 (79.7)	12,203 (20.3#)

SD, standard deviation; IQR, interquartile range. *After adjusting for the socio-economic status and 31 provinces, the difference in physical activity level between urban and rural areas is statistically significant, p < 0.001 (^#Chi square test).