Table 1.

Frequency distribution of baseline study population (in total) and intervention and control group (after residential weight reduction programme), (N = 137)

				Total	Intervention	Control	p-values.
				N=137	N=65	N=72
sex		male	N(%)	65 (47.4)	32 (49.2)	33 (45.8)	0.691***
		female	N(%)	72 (52.6)	33 (50.8)	39 (54.2)
age (years)	at recruitment (T-3)		mean (±sd)	13.65 (±1.88)	13.85 (±1.94)	13.47 (±1.82)	0.236*
	at randomisation (T0)		mean (±sd)	13.97 (±1.86)	14.17 (±1.93)	13.79 (±1.80)	0.237*
pubertal stage	at recruitment (T-3)	prepubertal	N(%)	16 (11.7)	7 (10.8)	9 (12.5)	0.368**
		interpubertal	N(%)	51 (37.2)	22 (33.8)	29 (40.3)
		postpubertal	N(%)	70 (51.1)	36 (55.4)	34 (47.2)
	at randomisation (T0)	prepubertal	N(%)	10 (7.3)	4 (6.2)	6 (8.3)	0.203**
		interpubertal	N(%)	42 (30.7)	17 (26.2)	25 (34.7)
		postpubertal	N(%)	85 (62.0)	44 (67.7)	41 (56.9)
Migration background		German	N(%)	67 (48.9)	30 (46.2)	37 (51.4)	0.639***
		Turkish	N(%)	39 (28.5)	18 (27.7)	21 (29.2)
		other	N(%)	31 (22.6)	17 (26.2)	14 (19.4)
Education background (parents)		No certificate	N(%)	6 (4.4)	2 (3.1)	4 (5.6)	0.797***
		General education	N(%)	17 (12.4)	6 (9.2)	11 (15.3)
		Secondary modern school	N(%)	58 (42.3)	28 (43.1)	30 (41.7)
		Grammar school	N(%)	29 (21.2)	14 (21.5)	15 (20.8)
		college of higher education, university	N(%)	19 (13.9)	11 (16.9)	8 (11.1)
		other	N(%)	8 (5.8)	4 (6.2)	4 (5.6)
Education background (parents)		lower level	N(%)	23 (16.8)	8 (12.3)	15 (20.8)	0.587***
		middle level	N(%)	58 (42.3)	28 (43.1)	30 (41.7)
		higher level	N(%)	48 (35.0)	25 (38.5)	23 (31.9)
		others	N(%)	8 (5.8)	4 (6.2)	4 (5.6)
BMI-SDS	at recruitment (T-3)		mean (±sd)	2.52 (±.40)	2.51 (±.38)	2.52 (±.42)	0.851*
	at randomisation (T0)		mean (±sd)	2.10 (±.47)	2.06 (±.47)	2.14 (±.47)	0.333*

*t-test for independent samples/ ** Man-Whitney-U-test/ *** Chi-square-test