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Fraction of inspired oxygen and postoperative nausea and vomiting. Results from random‐effects meta‐analyses of trials assessing fraction of inspired oxygen. Results are displayed as odds ratios (dots) with 95% confidence intervals (error bars). Values below 1 indicate reduced postoperative nausea and vomiting with 80% inspired oxygen. Subgroup analysis by abdominal surgeries, gynecological surgeries, and various surgeries.
