Table 1 Demographic characteristics of the sample in the test (N = 695) and retest (N = 487)

Sex

Boys

334

48.1

233

47.8

Girls

361

51.9

254

52.2

Age

11.0

0.5

11.9

0.5

BMI

17.8

2.5

18.3

2.3

SES

0.25

0.91

0.30

0.90

Household composition

Two parent family

570

82.0

399

81.9

Others

125

18.0

88

18.1

Membership sports club

No

89

12.8

63

12.9

Yes

606

87.2

424

87.1

Frequency of sports participation

2.92

1.44

2.51

1.64

Nonathletes

89

12.8

68

14.0

Low sports actives

229

32.9

130

26.7

Moderate sports actives

194

27.9

166

34.1

High sports actives

183

26.3

123

25.3

Individual versus team sports

Nonathletes

89

12.8

68

14.0

Individual sports

161

23.2

108

22.2

Team sports

325

46.8

236

48.5

Individual as well as team sports

120

17.3

75

15.4

Indoor versus outdoor sports

Nonathletes

89

12.8

68

14.0

Indoor sports

207

29.8

130

23.7

Outdoor sports

308

44.3

239

49.1

Indoor as well as outdoor sports

91

13.1

50

10.3

Contact versus non-contact sports

Nonathletes

89

12.8

68

14.0

Non-contact sports

240

34.5

161

33.1

Contact sports

277

39.9

205

42.1

Non-contact as well as contact sports

89

12.8

53

10.9

Involvement in competition or not

Nonathletes

89

12.8

68

14.0

Training activities

139

20.0

86

17.7

Competition

467

67.2

333

68.4

Psychosocial health

internalizing problems

3.97

2.78

3.21

2.83

normal

647

93.1

453

93.0

abnormal

48

6.9

34

7.0

externalizing problems

5.53

3.07

5.16

3.17

normal

572

82.3

403

82.8

abnormal

123

17.7

84

17.2

prosocial behaviour

7.90

1.62

8.31

1.56

normal

642

92.4

450

92.4

abnormal

53

7.6

37

7.6