Table 2.

Evolution of the body mass index z-score (zBMI) in the participants of the control and intervention groups during the study.

zBMI	Control					Intervention
	n	Baseline	Final	Change	p	n	Baseline	Final	Change	p
1st year	138	0.17 ± 0.82	0.14 ± 0.96	−0.03	0.261	121	0.23 ± 1.18	0.10 ± 0.99	−0.13	0.002 *
2nd year	132	0.16 ± 0.83	0.17 ± 1.03	0.01	0.423	115	0.24 ± 1.21	0.14 ±1.05	−0.10	0.021 *

Data are expressed as mean ± standard deviation. The baseline value at the beginning of the study is compared with the final value at the end of the first year in the first row and the final value at the end of the second year in the second row. * Significant change compared to baseline (before the intervention).