Table 1.

 Baseline characteristics of 502 elementary schoolchildren according to treatment arm and grade. Values are numbers (percentages) unless stated otherwise

	First grade			Fifth grade
	Intervention (n=131)	Control (n=91)		Intervention (n=166)	Control (n=114)
Girls	64 (49)	50 (55)		91 (55)	52 (46)
Mean (SD) age (years)	6.9 (0.3)	6.9 (0.3)		11.0 (0.5)	11.3 (0.6)
Overweight*	34 (26)	26 (29)		41 (25)	28 (25)
Tanner stage >1	0	0		83 (50)	54 (48)
Migrant families†	45 (34)	23 (26)		41 (25)	27 (24)
No formal parental education	12 (9)	4 (5)		19 (12)	12 (11)

*Based on Swiss national centiles.

†Both parents from Eastern or Southern European countries, Africa, Asia, Central or South America, or other less developed countries.