Fig. 5From: 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 subgroup analysis of the incidence of postoperative atelectasis between the ultrasound-guided and control groups. Grouped by age: age ≥ 18 years (adult), age < 18 years (children). CI = confidence interval, RR = risk ratio, M-H = methods of merging dichotomous variablesBack to article page