| Outcome | No. of studies | No. of participants | Statistical method | Effect size |
| Time to clinical improvement | 2 | 880 | Hazard Ratio (95% CI) | 1.28 (0.88 to 1.87) |
| Time to death | 1 | 460 | Hazard Ratio (95% CI) | 0.55 (0.33 to 0.91) |
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