Study ID	Group	Number of clusters	Number of participants	Number of clusters	Number of participants	Mean cluster size	Design effect (M) for 0.04	SE of effect size, with no adjustment for clustering SE = 0.0	SE of effect size, adjusting for clustering using ICC = 0.04
Children aged: 0‐5 years Setting: Childcare Duration of intervention: ≤ 12 months Intervention: PA
Annesi 2013	‐	60	690	38	464	11.77551	1.43102	0.102	0.122018
Children aged: 0‐5 years Setting: Childcare Duration of intervention: ≤ 12 months Intervention: DPA
Bonis 2014	‐	13	110	13	99	8.038462	1.281538	0.276	0.312446
Klein 2010	‐	16	678	11	361	38.48148	2.499259	0.05	0.079045
Children aged: 6‐12 years Setting: School Duration: ≤ 12 months Intervention: D
Herscovici 2013	Boys	4	96	2	86	30.33333	2.173333	0.11	0.162165
Herscovici 2013	Girls	4	109	2	68	29.5	2.14	0.15	0.219431
Children aged: 6‐12 years Setting: School Duration: ≤ 12 months Intervention PA
Lazaar 2007	Obese girls	14	69	5	94	8.578947	1.303158	0.7496	0.855713
Lazaar 2007	Non‐obese girls	14	30	5	21	2.684211	1.067368	0.1837	0.189787
Lazaar 2007	Non‐obese boys	14	30	5	21	2.684211	1.067368	0.1837	0.189787
Lazaar 2007	Obese boys	14	69	5	94	8.578947	1.303158	0.6364	0.726488
Robbins 2006	‐	1	41	1	36	38.5	2.5	1.5604	2.467209
Thivel 2011	Normal weight	14	229	5	228	24.05263	1.922105	0.117	0.162209
Thivel 2011	Obese weight	14	229	5	228	24.05263	1.922105	0.48	0.665472
Children aged: 6‐12 years Setting: School Duration: > 12 months Intervention: DPA
Llargues 2012	‐	8	225	8	201	26.625	2.025	0.327	0.465329
Children aged: 13‐18 years Setting: School Duration: ≤ 12 months Intervention: DPA
Melnyk 2013	‐	5	358	6	421	70.81818	3.792727	0.077	0.149957
BMI: body‐mass index; D: diet; DPA: diet and physical activity; PA: physical activity; RCT: randomised controlled trial; SE: standard error; zBMI: body‐mass index z score