GENDER – male; Adequacy – small for gestational age ; Hypertension – maternal systemic arterial hypertension; Smoking – maternal smoking; Chorio – chorioamnionitis; Antenatal_cortic – antenatal corticosteroids; SURF – need for surfactant; RespSupp14th_0 – none respiratory support on the 14th day of life (0); RespSupp14th_1e2 – nasal oxygen catheter/CPAP/NIPPV (1) or MV/HFV (2) on the 14th day of life; PDA – patent ductus arteriosus; NEC_uptothe14th – necrotizing enterocolitis up to the 14th day of life; EARLYSEPSIS – early sepsis; LATESEPSIS – late sepsis up to the 14th day of life; GAdays – gestational age in days; WEIGHT_g – birth weight in grams; FiO214th – fraction of inspired oxygen on the 14th day of life.
Table 2 – Association between antenatal and postnatal variables and bronchopulmonary dysplasia according to its severity