Risk and Relative Risk of Comorbidity Outcome
BPD, patent ductus arteriosus, ROP
BRONCHOPULMONARY DYSPLASIA, REGRESSION, RETINOPATHY OF PREMATURITY
Abbreviations: BPD, bronchopulmonary dysplasia; HHHFNC, heated humidified high-flow nasal cannula; NCPAP, nasal continuous positive airway pressure; PDA, patent ductus arteriosus; ROP, retinopathy of prematurity; RR, relative risk.The estimates were computed using Poisson regression with robust error variance.