Comparison 7. BMI.

Outcome or subgroup title	No. of studies	No. of participants	Statistical method	Effect size
7.1 BMI	15	3932	Mean Difference (IV, Random, 95% CI)	‐0.08 [‐0.23, 0.07]
7.2 BMI (sensitivity: studies with no industry funding)	13	3319	Mean Difference (IV, Random, 95% CI)	‐0.10 [‐0.28, 0.07]
7.3 BMI (Health Promoting Schools: curriculum versus no curriculum)	15	3932	Mean Difference (IV, Random, 95% CI)	‐0.08 [‐0.23, 0.07]
7.3.1 Curriculum	13	3506	Mean Difference (IV, Random, 95% CI)	‐0.13 [‐0.29, 0.03]
7.3.2 No curriculum	2	426	Mean Difference (IV, Random, 95% CI)	0.27 [‐0.15, 0.68]
7.4 BMI (SES: low versus high/unclear)	15	3932	Mean Difference (IV, Random, 95% CI)	‐0.08 [‐0.23, 0.07]
7.4.1 Low	11	2804	Mean Difference (IV, Random, 95% CI)	‐0.10 [‐0.29, 0.08]
7.4.2 High/unclear	4	1128	Mean Difference (IV, Random, 95% CI)	0.02 [‐0.17, 0.22]
7.5 BMI (study size: small (< 400 participants) versus large (≥ 400 participants))	15	3932	Mean Difference (IV, Random, 95% CI)	‐0.08 [‐0.23, 0.07]
7.5.1 Small (< 400 participants)	13	2705	Mean Difference (IV, Random, 95% CI)	‐0.11 [‐0.31, 0.09]
7.5.2 Large (≥ 400 participants)	2	1227	Mean Difference (IV, Random, 95% CI)	‐0.04 [‐0.17, 0.08]