Comparison 3. Subgroup analysis.

Outcome or subgroup title	No. of studies	No. of participants	Statistical method	Effect size
3.1 Overall health and well‐being	11	2386	Std. Mean Difference (IV, Random, 95% CI)	0.14 [0.03, 0.24]
3.1.1 Family‐centred care (FCC) education	7	1541	Std. Mean Difference (IV, Random, 95% CI)	0.13 [0.02, 0.23]
3.1.2 FCC counselling	2	378	Std. Mean Difference (IV, Random, 95% CI)	0.19 [‐0.15, 0.53]
3.1.3 FCC environment	1	178	Std. Mean Difference (IV, Random, 95% CI)	0.52 [0.05, 0.99]
3.1.4 FCC education and counselling	1	289	Std. Mean Difference (IV, Random, 95% CI)	‐0.10 [‐0.33, 0.13]
3.2 Physical health and developmental health outcomes of children	8	1961	Std. Mean Difference (IV, Random, 95% CI)	0.13 [‐0.00, 0.26]
3.2.1 FCC education	4	1116	Std. Mean Difference (IV, Random, 95% CI)	0.11 [‐0.01, 0.24]
3.2.2 FCC counselling	2	378	Std. Mean Difference (IV, Random, 95% CI)	0.19 [‐0.15, 0.53]
3.2.3 FCC environment	1	178	Std. Mean Difference (IV, Random, 95% CI)	0.52 [0.05, 0.99]
3.2.4 FCC education and counselling	1	289	Std. Mean Difference (IV, Random, 95% CI)	‐0.10 [‐0.33, 0.13]
3.3 Family health‐enhancing lifestyle or behavioural outcomes	9	1969	Std. Mean Difference (IV, Random, 95% CI)	0.16 [‐0.06, 0.39]
3.3.1 FCC education	7	1546	Std. Mean Difference (IV, Random, 95% CI)	0.17 [‐0.09, 0.43]
3.3.2 FCC environment	1	169	Std. Mean Difference (IV, Random, 95% CI)	0.34 [‐0.24, 0.93]
3.3.3 FCC education and counselling	1	254	Std. Mean Difference (IV, Random, 95% CI)	‐0.08 [‐0.62, 0.47]