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| Outcome or subgroup title | No. of studies | No. of participants | Statistical method | Effect size |
|---|---|---|---|---|
| 1 Mortality stratified by study type | 5 | Risk Ratio (M‐H, Random, 95% CI) | Subtotals only | |
| 1.1 Serious risk of bias | 1 | 63 | Risk Ratio (M‐H, Random, 95% CI) | 0.39 [0.16, 0.95] |
| 1.2 Critical risk of bias | 4 | 431 | Risk Ratio (M‐H, Random, 95% CI) | 0.57 [0.38, 0.85] |
