Table 1.

Characteristics of the study population (N = 35,434)

Characteristic	Mean	SD
Age [years]	6.28	0.34
Weight [kg]	22.85	4.11
Height [cm]	120.05	5.53
BMI [kg/m2]	15.77	2.03
No of persons in the child's living place (N = 34,997)	3.91	1.06
	N	%
Overweight	35,434	15.48
Obese	35,434	4.33
Male sex	35,434	50.89
Age group	35,434
5.0 – < 5.5 years		0.23
5.5 – < 6.0 years		23.98
6.0 – < 6.5 years		47.91
6.5 – < 7.0 years		26.15
7.0 – < 7.5 years		1.42
7.5 – < 8.0 years		0.32
German nationality	35,146	92.22
Study region: East	35,434	67.73
Study location: Urban	35,434	76.14
Parental educational level:	33,984
< 10 years of schooling		11.48
10 years of schooling		44.82
> 10 years of schooling		43.69
Living space > 75 m2	34,095	49.51
Single child	34,997	33.86
Attendance of day nursery	33,826	56.49
Smoking in the living place	33,208	45.00
Passive smoking during the first 3 years of life	34,693	31.95
Smoking during pregnancy	34,578	13.72
Breastfeeding > 3 months	33,106	31.63
Preterm delivery	34,540	6.45
Birth weight	34,809
< 2500 g		5.76
2500 – < 3000		17.00
3000 – < 3500		38.32
3500 – < 4000		29.45
> 4000		9.47