p_g < 0.001

Age groups

Under 6 years

(n = 350)

6 - 9 years

(n = 398)

10 - 12 years

(n = 363)

13 years and more

(n = 241)

p value

In the playground

61.7%

71.9%

62.5%

17.0%

p < 0.001

During physical education

7.4%

14.6%

22.9%

41.5%

p_t < 0.001

In classes

14.3%

4.5%

2.5%

14.1%

p < 0.001

Other places

16.6%

9.0%

12.1%

27.4%

p < 0.001