Using multivariable analysis to adjust for potential confounders , our objective was to compare two outcomes : 1 ) composite neonatal morbidity ( Apgar score 3 or less at 5 minutes , seizure , sepsis , necrotizing enterocolitis grade II or III , intraventricular hemorrhage grade III or IV , or death before discharge ) and 2 ) neurologic injury ( cerebral palsy ) at 2 years or more of corrected age between the groups .