Figure 2.

Rank order of the 18 evaluated definitions of bronchopulmonary dysplasia (BPD). The definitions are ordered from highest (top) to lowest (bottom) accuracy for predicting death between 36 weeks’ postmenstrual age (PMA) and 18- to 26-month follow-up or serious respiratory morbidity. Concordance (c) statistic values were calculated using logistic regression, adjusting for gestational age, birth weight, sex, small for gestational age, race/ethnicity, treatment with antenatal corticosteroids, treatment with antenatal magnesium, maternal level of education, insurance type, primary caregiver marital status, and study center. NC = nasal cannula; nCPAP = nasal continuous positive airway pressure; NDI = neurodevelopmental impairment; NIPPV = nasal intermittent positive pressure ventilation; PPV = positive pressure ventilation.