Composite severe neonatal morbidity ( sepsis , severe intraventricular hemorrhage , periventricular leukomalacia , severe necrotizing enterocolitis , bronchopulmonary dysplasia , and/or death ) and composite severe childhood morbidity at age @ years ( moderate or severe cerebral palsy and/or Bayley II Infant and Toddler Development scores greater than @ SD below the mean ) were compared .