Table 3.

Multilevel^a linear regression analysis on 8-year changes in BMI-SDS, z-score of fat mass (FM) and waist circumference (WC) in intervention and non-intervention students

Independent variables	Dependent variable 8-year change in BMI-SDS		8-year change in z-score FM		8-year change in z-score WC
	β-coefficientb ± SE	p	ß-coefficientb ± SE	p	β-coefficientb ± SE	p
	Intervention	0.435 ± 0.39	0.266	0.416 ± 0.49	0.396	0.046 ± 0.44	0.917
BMI-SDS / z-score of FM / WC at baselinec	−0.372 ± 0.02	0.000	−0.514 ± 0.03	0.000	−0.345 ± 0.03	0.000
Sex	−0.026 ± 0.04	0.564	0.002 ± 0.06	0.966	−0.015 ± 0.05	0.770
SES	−0.071 ± 0.03	0.020	−0.120 ± 0.04	0.002	−0.044 ± 0.03	0.209
BMI of mothers	0.025 ± 0.01	0.000	0.033 ± 0.01	0.000	0.022 ± 0.01	0.000
Intervention × sex	0.048 ± 0.10	0.636	0.020 ± 0.13	0.874	−0.024 ± 0.11	0.830
Intervention × SES	−0.159 ± 0.07	0.020	−0.131 ± 0.09	0.129	−0.108 ± 0.08	0.161
Intervention × BMI of mothers	−0.007 ± 0.01	0.572	−0.005 ± 0.02	0.769	−0.006 ± 0.01	0.673

^aAll analyses are adjusted for clustering effect in schools.

^bSignificant β-coefficients are printed in italics.

^cBMI-SDS: R² = 0.307. FM: R² = 0.271; WC: R² = 0.132.