Fig. 2From: Antiemetic prophylaxis with droperidol in morphine-based intravenous patient-controlled analgesia: a propensity score matched cohort studyAntiemetic effect of droperidol attenuated 36 h after surgery (*** p < 0.001, *p < 0.05; CI = confidence interval, POH = postoperative hour, PONV = postoperative nausea and vomiting)Back to article page