Table 1 Subject characteristics by sports club participation and gender

Age, mean (SD)

15.5(1)

15.5(0)

0.643

15.5(1)

15.5(0)

0.880

15.5(1)

15.5(1)

0.839

BMI, mean (SD)

20.9(2)

21.5(4)

<0.05

20.6(2)

21.1(4)

<0.05

20.7(2)

21.3(4)

<0.002

Menarche,% (n = 882)

-

-

92.8 %

97.5 %

<0.001

-

-

-

Chronic disease,^a%

30.4 %

26.4 %

0.242

30.1 %

29.4 %

0.818

30.2 %

28.1 %

0.358

Regular medication,^b%

23.5 %

18.6 %

0.113

29.0 %

33.2 %

0.189

26.2 %

27.1 %

0.680

NSAID use, previous month,%

59.6 %

46.1 %

<0.001

75.0 %

73.7 %

0.655

67.2 %

62.2 %

<0.05

Special diet,^c%

8.0 %

5.7 %

0.245

17.2 %

18.0 %

0.754

12.5 %

12.9 %

0.804

Dietary supplements use,^d%

67.3 %

36.8 %

<0.001

70.1 %

57.2 %

<0.001

68.7 %

48.7 %

<0.001

No Smoking, %

94.5 %

81.4 %

<0.001

92.6 %

73.9 %

<0.001

93.6 %

77.0 %

<0.001

Screen time,^e mean (SD)

4.6(4)

6.4(5)

<0.001

3.6(2)

5.6(5)

<0.001

4.1(3)

5.9(5)

<0.001

Leisure time PA, ^{f, g} %

<0.001

<0.001

<0.001

 Approx. <30 min/week

0.8 %

15.4 %

0.9 %

18.5 %

0.8 %

17.2 %

 Approx. 1–3 h/week

16.3 %

53.9 %

14.9 %

56.9 %

15.6 %

55.6 %

 Approx. 4–6 h/week or more

82.9 %

30.7 %

84.2 %

24.6 %

83.5 %

27.2 %