Introduction
BPD, death, prematurity
BRONCHOPULMONARY DYSPLASIA (BPD)
Bronchopulmonary dysplasia (BPD) remains the most common serious morbidity of extreme prematurity,The recently conducted National Institute of Child Health and Human Development Neonatal Research Network (NICHD NRN) Hydrocortisone Trial compared hydrocortisone with placebo in extremely preterm infants receiving mechanical ventilation between postnatal days 14 and 28.The NICHD Neonatal BPD Outcome Estimator uses clinical covariates to estimate infants’ risk at various postnatal time points for the individual outcomes of death; mild, moderate, or severe BPD; or no BPD.