Table 1 Baseline characteristics of the study sample (n = 296)

Age (years)

12.82

2.4

Body height (cm)

154.51

13.3

Body weight (kg)

49.90

14.3

Body mass index z-score

0.62

1.09

n

%

Girls

145

49.0

Maternal education level

 No formal education

4

1.4

 Primary education

53

17.9

 Secondary education

52

17.6

 Technical and further education

93

31.3

 University degree

94

31.8

Weight status

 Underweight

1

0.3

 “Normal” weight

178

60.1

 Overweight

86

29.1

 Obesity

31

10.5

Pubertal development

 Stage 1

11

3.7

 Stage 2

79

26.7

 Stage 3

100

33.8

 Stage 4

77

26.0

 Stage 5

29

9.8