Table 3

Relative risk (95% confidence intervals) of being in the top third of total physical activity in adulthood according to third of physical activity in childhood, by sex and baseline age group

	Total weekly PA in adulthood
	9–12 years at baseline		13–15 years at baseline
Childhood PA	Males (n=528)	Females (n=646)	Males (n=410)	Females (n=463)
Total weekly PA
Bottom third	1.0 (ref)	1.0 (ref)	1.0 (ref)	1.0 (ref)
Middle third	1.1 (0.8, 1.5)	1.0 (0.8, 1.3)	1.2 (0.8, 1.6)	0.8 (0.6, 1.1)
Top third	1.1 (0.8, 1.4)	0.9 (0.7, 1.2)	1.3 (1.0, 1.9)	1.0 (0.8, 1.4)
p_trend	0.72	0.39	0.08	0.72
Leisure PA
Bottom third	1.0 (ref)	1.0 (ref)	1.0 (ref)	1.0 (ref)
Middle third	1.3 (0.9, 1.7)	1.0 (0.8, 1.3)	1.0 (0.8, 1.5)	1.2 (0.9, 1.6)
Top third	1.1 (0.8, 1.5)	0.8 (0.6, 1.1)	1.0 (0.7, 1.4)	1.1 (0.8, 1.5)
p_trend	0.59	0.12	0.87	0.47
Transport PA
Bottom third	1.0 (ref)	1.0 (ref)	1.0 (ref)	1.0 (ref)
Middle third	1.1 (0.8, 1.5)	1.1 (0.9, 1.5)	1.1 (0.8, 1.6)	1.2 (0.9, 1.6)
Top third	1.0 (0.8, 1.3)	0.9 (0.7, 1.2)	0.9 (0.7, 1.3)	1.0 (0.8, 1.4)
p_trend	0.94	0.46	0.74	0.80
School sport
Bottom third	1.0 (ref)	1.0 (ref)	1.0 (ref)	1.0 (ref)
Middle third	0.6 (0.4, 0.9)^†	0.8 (0.6, 1.1)	1.0 (0.7, 1.6)	0.8 (0.5, 1.1)
Top third	0.9 (0.7, 1.2)	0.9 (0.7, 1.2)	1.4 (1.1, 1.9)^†	1.0 (0.7, 1.3)
p_trend	0.31	0.43	0.01	0.76
School PE
Bottom third	1.0 (ref)	1.0 (ref)	1.0 (ref)	1.0 (ref)
Middle third	1.1 (0.8, 1.5)	1.3 (0.9, 1.7)	1.0 (0.7, 1.5)	1.1 (0.8, 1.5)
Top third	1.9 (0.8, 1.5)	1.5 (1.1, 1.9)^*	1.2 (0.9, 1.6)	1.3 (0.9, 1.7)
p_trend	0.60	0.004	0.34	0.12
Past year sport
≤One	1.0 (ref)	1.0 (ref)	1.0 (ref)	1.0 (ref)
Two	1.2 (0.8, 1.7)	0.8 (0.6, 1.0)	0.8 (0.6, 1.2)	0.6 (0.4, 0.9)^*
≥Three	1.6 (1.1, 2.3)^*	0.9 (0.7, 1.1)	0.8 (0.6, 1.1)	0.9 (0.7, 1.2)
p_trend	0.003	0.26	0.21	0.93

↵* p<0.01,
↵† p<0.05 (bold indicates statistically significant association).
PA, physical activity; PE, physical education; RR, relative risk.