Table 1.

The duration of physical activity at baseline and at follow-up

	Cases	Controls
Organized physical activity (hours/week)
Baseline before intervention
Outside the school	0.7 ± 1.2	1.3 ± 1.6
Baseline after intervention
School curriculum	3.3	1.0 **
Outside the school	0.7 ± 1.2	1.3 ± 1.6
Total physical activity	4.0 ± 1.2	2.3 ± 1.6 **
Follow-up
School curriculum	3.3	1.0 **
Outside the school	1.1 ± 1.3	1.9 ± 1.9 *
Total physical activity	4.4 ± 1.3	2.9 ± 1.9 **

Data presented as mean ± SD. *P < 0.05, **P < 0.001