IL18 and Patent ductus arteriosus: A ROC analysis, using sB7-H3 (7d), IL-18 (14d), NCIS, electrolyte disturbance, hs-PDA, and the age that infants achieved 120 kcal/kg.d via enteral feeding ≥40 days after birth (and the non-BPD group as a reference), revealed that all these factors can be potential predictors of BPD (Figure 1).