Table 1.

Participants’ characteristics.

	Total (n = 520,533)		Boys (n = 25,1788)		Girls (n = 268,745)
	n	% (95% CI)	n	% (95% CI)	n	% (95% CI)
Age
11 years	55,782	10.7 (10.5, 11.0)	27,153	10.8 (10.4, 11.2)	28,629	10.7 (10.3, 11.0)
12 years	25,609	4.9 (4.7, 5.2)	12,246	4.9 (4.5, 5.2)	13,363	5.0 (4.6, 5.3)
13 years	116,031	22.3 (22.1, 22.5)	54,536	21.7 (21.3, 22.0)	61,495	22.9 (22.6, 23.2)
14 years	116,894	22.5 (22.2, 22.7)	55,184	21.9 (21.6, 22.3)	61,710	23.0 (22.6, 23.3)
15 years	131,520	25.3 (25.0, 25.5)	64,961	25.8 (25.5, 26.1)	66,559	24.8 (24.4, 25.1)
16 years	53,582	10.3 (10.0, 10.6)	27,251	10.8 (10.5, 11.2)	26,331	9.8 (9.4, 10.2)
17 years	21,115	4.1 (3.8, 4.3)	10,457	4.2 (3.8, 4.5)	10,658	4.0 (3.6, 4.3)
HDI
Very high	225,408	43.3 (43.1, 43.5)	110,258	43.8 (43.5, 44.1)	115,150	42.8 (42.6, 43.1)
High	185,430	35.6 (35.4, 35.8)	89,604	35.6 (35.3, 35.9)	95,826	35.7 (35.4, 36.0)
Middle	87,088	16.7 (16.5, 17.0)	40,249	16.0 (15.6, 16.3)	46,839	17.4 (17.1, 17.8)
Low	22,607	4.3 (4.1, 4.6)	11,677	4.6 (4.3, 5.0)	10,930	4.1 (3.7, 4.4)
PA
Never	94,279	18.1 (17.9, 18.4)	37,395	14.9 (14.5, 15.2)	56,884	21.2 (20.8, 21.5)
1 days/week	69,607	13.4 (13.1, 13.6)	29,089	11.6 (11.2, 11.9)	40,518	15.1 (14.7, 15.4)
2 days/week	68,091	13.1 (12.8, 13.3)	29,280	11.6 (11.3, 12.0)	38,811	14.4 (14.1, 14.8)
3 days/week	64,870	12.5 (12.2, 12.7)	30,111	12.0 (11.6, 12.3)	34,759	12.9 (12.6, 13.3)
4 days/week	50,501	9.7 (9.4, 10.0)	25,403	10.1 (9.7, 10.5)	25,098	9.3 (9.0, 9.7)
5 days/week	51,611	9.9 (9.7, 10.2)	27,098	10.8 (10.4, 11.1)	24,513	9.1 (8.8, 9.5)
6 days/week	32,193	6.2 (5.9, 6.4)	17,855	7.1 (6.7, 7.5)	14,338	5.3 (5.0, 5.7)
Every day	89,381	17.2 (16.9, 17.4)	55,557	22.1 (21.7, 22.4)	33,824	12.6 (12.2, 12.9)

Abbreviation: HDI, Human development index; PA, physical activity.