Comparison 4. Sensitivity analysis by blinding of outcome assessment.

Outcome or subgroup title	No. of studies	No. of participants	Statistical method	Effect size
1 30‐day mortality	21	10388	Risk Ratio (M‐H, Random, 95% CI)	0.99 [0.82, 1.18]
1.1 Low risk	16	9356	Risk Ratio (M‐H, Random, 95% CI)	1.00 [0.81, 1.24]
1.2 Unclear or high risk	5	1032	Risk Ratio (M‐H, Random, 95% CI)	0.93 [0.56, 1.55]