Comparison 1. IVIG versus placebo or no treatment in adults.

Outcome or subgroup title	No. of studies	No. of participants	Statistical method	Effect size
1.1 Event‐free survival	1	62	Risk Ratio (M‐H, Random, 95% CI)	1.76 [0.48, 6.40]
1.2 Overall survival	2	103	Risk Ratio (M‐H, Random, 95% CI)	0.91 [0.23, 3.62]
1.3 Change in LVEF	2	103	Mean Difference (IV, Random, 95% CI)	‐0.01 [‐0.06, 0.05]
1.4 Peak oxygen consumption	1	48	Mean Difference (IV, Random, 95% CI)	‐0.80 [‐4.57, 2.97]
1.5 Side effects	1	62	Risk Ratio (M‐H, Random, 95% CI)	20.29 [1.25, 329.93]
1.6 Failure to attain complete recovery	1	41	Risk Ratio (M‐H, Random, 95% CI)	0.46 [0.19, 1.14]