Mortality endpoints | Number of | Relative risk | Risk difference | |||
---|---|---|---|---|---|---|
Studies | Patients | Effect size (95% CI) | I2 | Effect size (95% CI) | I2 | |
Randomized controlled trials a | Â | Â | Â | Â | Â | Â |
 ICU mortality | 3 | 292 | 0.55 (0.24 to 1.25) | 75% | −0.28 (−0.53 to −0.03)* | 76% |
 Hospital mortality | 2 | 201 | 0.49 (0.12 to 2.07) | 77% | −0.26 (−0.65 to 0.13) | 75% |
 60-day mortality | 2 | 279 | 0.97 (0.75 to 1.26) | 0% | −0.01 (−0.12 to 0.10) | 0% |
Cohort studies | Â | Â | Â | Â | Â | Â |
 ICU mortality | 5 | 226 | 1.05 (0.74 to 1.49) | 1% | Not calculable | - |
 Hospital mortality | 4 | 317 | 1.00 (0.23 to 4.34) | 75% | Not calculable | - |
 60-day mortality | 2 | 264 | 1.30 (0.96 to 1.78) | 0% | Not calculable | - |