Table 1.

Prevalence of having 60 minutes of exercise in school days and holidays

	Boys (n = 14,274)	Girls (n = 17,731)
	%	%	*P
School days
Age group
12 or below	66.8	52.5	<0.001
13	66.4	44.9	<0.001
14	65.4	41.6	<0.001
15	64.2	38.4	<0.001
16	64.1	33.6	<0.001
17	59.5	28.1	<0.001
18 or above	53.0	26.1	<0.001
All	63.8	39.6	<0.001
P for trend	<0.001	<0.001
Holidays
Age group
12 or below	80.3	70.6	<0.001
13	79.4	65.1	<0.001
14	79.8	61.9	<0.001
15	79.0	58.7	<0.001
16	77.9	53.8	<0.001
17	76.6	49.9	<0.001
18 or above	74.6	50.3	<0.001
All	78.7	60.0	<0.001
P for trend	<0.001	<0.001

* P-value for the level of significance of sex differences determined by Pearson's Chi-square test