| For dichotomous data | |||
| Code of paper | Outcomes | N2O‐based group(n) n = number of participants, not number of events | N2O‐free group(n) n = number of participants, not number of events |
| Primary outcomes | |||
| Inhospital case fatality rate | |||
| Secondary outcomes | |||
| Pneumonia | |||
| Pulmonary atelectasis | |||
| Myocardial infarction | |||
| Stroke | |||
| Severe nausea and vomiting | |||
| Venous thromboembolism | |||
| Wound infection rate | |||
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