Fig. 3From: Dexmedetomidine and sufentanil combination versus sufentanil alone for postoperative intravenous patient-controlled analgesia: a systematic review and meta-analysis of randomized controlled trialsForest plot of meta-analysis of VAS at 24 h (a) and 48 h postoperatively (b). DEX = dexmedetomidine; CI = confidence interval; VAS = visual analog scaleBack to article page