Comparison/subgroup	Number of RCTs	Pooled effect sizes not adjusted	Pooled effect sizes adjusted with ICC 0.04a
		MD (IV, random, 95% CI)	MD (IV, random, 95% CI)
· Diet vs control − setting	4	−0.07 (−0.17 to 0.03)	No change to datab
· School	3	−0.06 (−0.16 to 0.04)	No change to datab
· Wider community	1	−0.74 (−1.68 to 0.19)	No change to datab
Diet vs control − duration
· Duration of intervention ≤ 12 months
· Duration of intervention >12 months
Physical activity vs control − setting	13	−0.10 (−0.15 to −0.05)	−0.10 (−0.15 to −0.05)
· Wider community	2	−0.19 (−0.50 to 0.12)	−0.19 (−0.50 to 0.12)
· School	11	−0.10 (−0.14 to −0.05)	−0.10 (−0.14 to −0.06)
Physical activity vs control − duration	13	−0.10 (−0.15 to −0.05)	−0.10 (−0.14 to −0.05)
· Duration of intervention ≤ 12 months	10	−0.11 (−0.16 to −0.05)	−0.11 (−0.16 to −0.06)
· Duration of intervention > 12 months	3	0.00 (−0.14 to 0.14)	0.00 (−0.14 to 0.14)
Diet and physical activity vs control − setting	13	−0.10 (−0.15 to −0.05)	−0.10 (−0.14 to −0.05)
· School	10	−0.11 (−0.16 to −0.05)	−0.11 (−0.16 to −0.06)
· Wider community	3	0.00 (−0.14 to 0.14)	0.00 (−0.14 to 0.14)
Diet and physical activity vs control − duration	25	−0.05 (−0.11 to 0.01)	−0.05 (−0.11 to 0.01)
· Duration of intervention > 12 months	8	−0.08 (−0.19 to 0.03)	−0.08 (−0.18 to 0.03)
· Duration of intervention ≤ 12 months	17	−0.04 (−0.11 to 0.03)	−0.04 (−0.11 to 0.04)
BMI: body‐mass index; CI: confidence interval; ICC: intracluster correlation coefficient; IV: generic inverse variance; MD: mean difference; Random: random‐effects model; RCT: randomised controlled trial