Comparison 1. Peer support vs usual care.

Outcome or subgroup title	No. of studies	No. of participants	Statistical method	Effect size
1.1 Psychological distress	8	864	Std. Mean Difference (IV, Random, 95% CI)	‐0.10 [‐0.32, 0.11]
1.2 Confidence and self‐efficacy	8	542	Std. Mean Difference (IV, Random, 95% CI)	0.04 [‐0.14, 0.21]
1.3 Perception of coping	3	293	Std. Mean Difference (IV, Random, 95% CI)	‐0.08 [‐0.38, 0.21]
1.4 Quality of life	2	143	Std. Mean Difference (IV, Random, 95% CI)	0.03 [‐0.32, 0.38]
1.5 Family functioning	4	272	Std. Mean Difference (IV, Random, 95% CI)	0.15 [‐0.09, 0.38]
1.6 Perceived social support	4	191	Std. Mean Difference (IV, Random, 95% CI)	0.31 [‐0.15, 0.77]
1.7 Confidence and skill at navigating medical services	4	304	Std. Mean Difference (IV, Random, 95% CI)	0.05 [‐0.17, 0.28]