Fig. 1

The O/E LHR and clinical outcomes depending on mortality and ECMO requirement: survivors without ECMO (Group A, open circles), survivors with ECMO (Group B, open rectangles), non-survivors without ECMO (Group C, closed circles), and non-survivors with ECMO (group D, closed rectangles). The O/E LHR was compared among the 4 subgroups (A), survivors (A, B) versus non-survivors (C, D) (B), and survivors without ECMO (A) versus non-survivors or ECMO (B, C, D) (C). Long midline bars indicate the median value in each group, respectively. * P < .005, ** P < .05. O/E LHR, observed-to-expected lung area-to-head circumference ratio; ECMO, extracorporeal membrane oxygenation