Fig. 3From: Effect of ultrasound-guided lung recruitment to reduce pulmonary atelectasis after non-cardiac surgery under general anesthesia: a systematic review and meta-analysis of randomized controlled trialsForest plot for the incidence of postoperative atelectasis between the ultrasound-guided and control groups. CI = confidence interval, RR = risk ratio, M-H = methods of merging dichotomous variablesBack to article page