NPPB and bronchopulmonary dysplasia: ROC analysis using the TR velocity, NT-proBNP, VAP, days of FiO2 > 40%, transfusion volume of red blood cells, and the proportion of infants who received total enteral nutrition (120 kcal/kg.d) ≥24 d after birth indicated that these variables can be considered potential predictors or risk factors of BPD.