The risk factors of PNOV, with odds ratios (OR (95% CI)), were found for female (7.22 (3.35 - 15.53) p<0.01), history of motion sickness (5.76 (2.81 - 11.8); p<0.01), history of allergy (2.8; (1.3 - 6.04); p<0.05), use of morphine postoperative (3.62; (1.28 - 10.20); p<0.05).