Table 2.
Clinical outcomes and therapies employed according to the severity of bronchopulmonary dysplasia
P is for score test for trend (Jonckheere-Terpstra test for continuous variables and linear by linear association for categorical variables). The severity of bronchopulmonary dysplasia was defined according to the NICHD consensus definition (8). BPD, bronchopulmonary dysplasia; IVH, intraventricular hemorrhage; NEC, necrotizing enterocolitis; ROP, retinopathy of prematurity; PVL, periventricular leukomalacia.