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Percentage of 4086 patients randomized to all interventions with PONV (± 95% confidence intervals) according to the combinations of anesthetic strategies and the number of anti-emetic treatments given. Because remifentanil did not contribute significantly to the PONV risk, it is not displayed in this figure. Although the figure suggests there is an interaction between nitrogen and propofol in patients with no antiemetics, statistical analyses did not confirm this impression.
