Table 3

Results of the multivariate Cox regression analyses. HR are adjusted for clustering within schools.

	Overall			Leisure time PA			Sports
	HR (95% CI)	p Value		HR (95% CI)	p Value		HR (95% CI)	p Value
Gender			Gender			Age
Boys	1		Boys	1		9	1
Girls	1.60 (1.05 to 2.46)^†	0.030	Girls	1.99 (0.97 to 4.08)	0.060	10	1.88 (0.39 to 9.04)	0.431
Age			Ethnicity			11	2.72 (0.49 to 10.5)	0.294
9	1		Western	1		12	7.17 (1.48 to 34.85)^†	0.015
10	1.17 (0.48 to 2.85)	0.729	Non-western	0.39 (0.06 to 2.66)	0.388
11	1.29 (0.54 to 3.08)	0.574	Socio economic status
12	2.62 (1.01 to 6.80)^†	0.048	Low	1
Weekly exposure^*			Medium	0.43 (0.14 to 1.30)	0.429
Q1	1		High	0.36 (2.33 to 0.91)	0.851
Q2	0.18 (0.08 to 0.38)^†	<0.001	Weekly exposure^*
Q3	0.06 (0.02 to 0.38)^†	<0.001	Q1	1
Q4	0.03 (0.01 to 0.07)^†	<0.001	Q2	0.68 (0.24 to 1.95)	0.468
			Q3	0.71 (0.25 to 1.98)	0.511
			Q4	0.36 (0.11 to 1.15)	0.085

↵* Groups represent age- and gender-specific quartiles sampled from the total population.
↵† Significant difference compared with reference category.
PA, physical activity.