Figure 1

Binary classifications of various target outcomes. 1(A): No BPD versus other conditions; 1(B): Grade 1 BPD or no BPD versus other conditions; 1(C): Death before 36 weeks’ PMA or Grade 3 BPD versus other conditions; 1(D): Death before 36 weeks’ PMA versus other conditions; BPD Bronchopulmonary dysplasia; Gr Grade; PMA Postmenstrual age.