Fig. 4

The distribution of the ratio of GGOs and CON in the peripheral or central lung region. A and B The percentage of lungs occupied by ground-glass opacification/opacity and consolidation were calculated in the peripheral and central regions (GGO%(P), GGO%(C), CON%(P), and CON%(C), respectively). C The central to peripheral ratio for GGO% and CON% were calculated (GGO(C/P) and CON(C/P)). D A correlation between GGO% and GGO(C/P). The boundary between the central and peripheral regions was set as 5 mm from the pleura. These variables were compared between patients with severe outcomes and those with nonsevere outcomes. P values were calculated by the Wilcoxon rank-sum test [P < 0.05 (*); P < 0.01 (**); P < 0.001 (***)]