Fig. 4From: Postoperative pain after different doses of remifentanil infusion during anaesthesia: a meta-analysisMixed meta-regression to assess the interaction between remifentanil doses and hyperalgesia (A; P=0.03) and PONV (B; P=0.37) at 24 h. The size of the markers is proportional to the size of the study. PONV, postoperative nausea and vomiting; Std diff, standardized differenceBack to article page