Comparison 2. Secondary outcomes.

Outcome or subgroup title	No. of studies	No. of participants	Statistical method	Effect size
2.1 Nutrition	11	16649	Std. Mean Difference (IV, Random, 95% CI)	0.08 [0.02, 0.15]
2.2 Physical activity	9	16389	Std. Mean Difference (IV, Random, 95% CI)	0.09 [‐0.02, 0.19]
2.3 Obesity	8	18618	Std. Mean Difference (IV, Random, 95% CI)	‐0.02 [‐0.05, 0.02]
2.4 Tobacco	3	3635	Std. Mean Difference (IV, Fixed, 95% CI)	‐0.03 [‐0.23, 0.18]