Fig. 3From: Patient-controlled intravenous analgesia with opioids after thoracoscopic lung surgery: a randomized clinical trialComparison of PONV score among three groups. POD, postoperative day; PONV, postoperative nausea and vomiting. AÂ POD 1; BÂ POD 2; CÂ POD 3Back to article page