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| Outcome or subgroup title | No. of studies | No. of participants | Statistical method | Effect size |
|---|---|---|---|---|
| 1 pulmonary complications | 11 | 1812 | Odds Ratio (M‐H, Fixed, 95% CI) | 1.01 [0.76, 1.34] |
| 2 Pulmonary complications for elective patients | 10 | 1554 | Odds Ratio (M‐H, Fixed, 95% CI) | 0.98 [0.72, 1.34] |
