Fig. 3

Forest 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 variables
Forest 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 variables