Fig. 3From: Usefulness of criteria for intraoperative Management of Postoperative Nausea and VomitingChanges in PONV incidence. The bar graph shows the changes in the incidence of postoperative nausea and vomiting (PONV) before and after the criteria in all patients and by the Apfel simplified score. Incidence of PONV in the pre-criteria (□) and post-criteria (■) groups. a) Chi-squared test. b) Fisher’s exact test.Back to article page