Fig. 3.
Risk ratios for postoperative nausea and vomiting in prespecified subgroups Body mass index is defined as body mass in kilograms divided by the square of height in meters. The ASA criteria for physical status include classifications for normal health (I), mild systemic disease (II), and severe systemic disease (III). *P = 0.030 after adjustment of multiple testing (number of hypothesis tests = 71). †P = 0.048 after adjustment of multiple testing (number of hypothesis tests = 71). ‡P > 0.999 after adjustment of multiple testing (number of hypothesis tests = 71). §P > 0.999 after adjustment of multiple testing (number of hypothesis tests = 71). ASA, American Society of Anesthesiologists.