Table 1.

Demographic and anthropometric characteristics of participants by school grade, sex, and residence locale from the 2016 Physical Activity and Fitness in China—The Youth Study.

	Sample size (n)	Age (year)c	Height (cm)c	Weight (kg)c
Grade schoola
Primary	89,949	8.8 ± 1.8	134.3 ± 11.6	31.7 ± 9.4
Junior middle	43,996	13.3 ± 1.1	159.2 ± 8.4	50.5 ± 11.0
Junior high	38,046	16.0 ± 0.9	165.6 ± 8.4	57.9 ± 10.9
Sexa
Boy
Primary	45,152	8.8 ± 1.8	134.5 ± 11.3	32.4 ± 9.6
Junior middle	22,031	13.4 ± 1.1	162.0 ± 9.2	52.4 ± 12.4
Junior high	18,782	16.0 ± 0.9	171.4 ± 6.4	62.5 ± 11.5
Girl
Primary	44,797	8.7 ± 1.8	134.0 ± 11.9	30.9 ± 9.1
Junior middle	21,965	13.3 ± 1.1	156.3 ± 6.2	48.5 ± 8.8
Junior high	19,264	16.0 ± 0.9	159.8 ± 5.7	53.4 ± 8.1
Residence localeb
Urban
Primary	19,843	10.2 ± 1.0	144.3 ± 8.6	38.6 ± 9.7
Junior middle	16,974	13.2 ± 1.0	160.8 ± 8.2	52.6 ± 11.6
Junior high	15,618	16.0 ± 0.9	167.0 ± 8.3	59.9 ± 11.7
Urban boy
Primary	9731	10.2 ± 1.0	144.2 ± 8.4	39.5 ± 10.1
Junior middle	8455	13.2 ± 1.0	164.0 ± 8.9	55.4 ± 13.0
Junior high	7798	16.0 ± 0.8	173.0 ± 6.1	65.2 ± 12.0
Urban girl
Primary	10,112	10.2 ± 0.9	144.4 ± 8.7	37.7 ± 9.1
Junior middle	8519	13.1 ± 1.0	157.7 ± 6.0	49.9 ± 9.3
Junior high	7820	15.9 ± 0.9	161.1 ± 5.5	54.5 ± 8.4
Rural
Primary	18,561	10.3 ± 1.0	141.5 ± 8.6	35.7 ± 8.7
Junior middle	20,186	13.4 ± 1.1	158.0 ± 8.2	48.9 ± 10.2
Junior high	15,906	16.0 ± 0.9	164.2 ± 8.2	56.2 ± 10.0
Rural boy
Primary	9327	10.4 ± 1.0	141.3 ± 8.4	36.2 ± 9.0
Junior middle	9916	13.4 ± 1.1	160.8 ± 9.1	50.4 ± 11.5
Junior high	7626	16.0 ± 0.9	170.1 ± 6.2	60.2 ± 10.5
Rural girl
Primary	9234	10.3 ± 1.0	141.8 ± 8.7	35.3 ± 8.3
Junior middle	10,270	13.3 ± 1.1	155.4 ± 6.1	47.5 ± 8.4
Junior high	8280	16.0 ± 0.9	158.8 ± 5.6	52.4 ± 7.7

^aBased on a sample size of 171,991 (boys = 85,965; girls = 86,026).

^bBased on a sample size of 107,088 with 52,435 children (boys = 25,984; girls = 26,451) living in urban areas and 54,653 children (boys = 26,869; girls = 27,784) living in rural areas.

^cData presented as mean ± SD.