Comparison 9. Diet and physical activity interventions versus control: age 13‐18 years.

Outcome or subgroup title	No. of studies	No. of participants	Statistical method	Effect size
9.1 zBMI ‐ setting	6	16543	Mean Difference (IV, Random, 95% CI)	0.01 [‐0.05, 0.07]
9.1.1 Home	1	75	Mean Difference (IV, Random, 95% CI)	0.06 [‐0.13, 0.26]
9.1.2 School	5	16468	Mean Difference (IV, Random, 95% CI)	0.00 [‐0.06, 0.06]
9.2 zBMI ‐ duration	6	16543	Mean Difference (IV, Random, 95% CI)	0.01 [‐0.05, 0.07]
9.2.1 Duration of intervention ≤ 12 months	3	2525	Mean Difference (IV, Random, 95% CI)	‐0.09 [‐0.18, 0.00]
9.2.2 Duration of intervention > 12 months	3	14018	Mean Difference (IV, Random, 95% CI)	0.01 [‐0.02, 0.04]
9.3 BMI ‐ setting	8	16583	Mean Difference (IV, Random, 95% CI)	‐0.02 [‐0.10, 0.05]
9.3.1 School	8	16583	Mean Difference (IV, Random, 95% CI)	‐0.02 [‐0.10, 0.05]
9.4 BMI ‐ duration	8	16583	Mean Difference (IV, Random, 95% CI)	‐0.02 [‐0.10, 0.05]
9.4.1 Duration of intervention > 12 months	2	12904	Mean Difference (IV, Random, 95% CI)	‐0.04 [‐0.17, 0.09]
9.4.2 Duration of intervention ≤ 12 months	6	3679	Mean Difference (IV, Random, 95% CI)	‐0.03 [‐0.11, 0.05]