Table 1 Participant characteristics at baseline by study arm (N = 1981). Results are presented as mean (SD) unless otherwise stated

N

647

577

757

Age (years)

13.9 (0.3)

14.0 (0.3)

14.0 (0.3)

Sex (% girls/boys)

50/50

49/51

49/50

Height (cm)

164.6 (8.1)

166.4 (7.7)

165.8 (7.7)

Weight (kg)

54.2 (10.8)

56.2 (11.0)

54.4 (10.5)

BMI (kg/m²)

19.9 (3.1)

20.2 (3.2)

19.7 (3.1)

 Primary school (%)

6.5

6.5

5.0

 Upper Secondary school (%)

27.1

31.5

28.3

 University < 4 years (%)

42.8

39.4

41.6

 University > 4 years (%)

23.6

22.5

25.1