| ASA | American Society of Anesthesiologists |
| CI | Confidence interval |
| COPD | Chronic obstructive pulmonary disease |
| FDR | False discovery rate |
| GI | Gastrointestinal |
| IPTW | Inverse probability of treatment weighting |
| MOAA/S | Modified Observer’s Assessment of Alertness/Sedation |
| OSAS | Obstructive sleep apnea syndrome |
| PACU | Post-anesthesia care unit |
| pp | Percentage point |
| SD | Standard deviation |
| SMD | Standardized mean difference |
| SpO2 | Peripheral oxygen saturation |
| STROBE | Strengthening the Reporting of Observational Studies in Epidemiology |
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