Logistic regression analysis of morbidities by gestational age, birth weight and multivariate.

*p̂ Birth weight categories: ≤500 g, 501-750 g, 751-100 g, and >1000 g.aIncluding: gestational age, birth weight, gender, cesarean section, antenatal steroids, Dutch nationality.bIntraventricular hemorrhage grade 3 or more and/or cystic periventricular leukomalacia.cSymptomatic patent ductus arteriosus which required treatment.dIncluding: Retinopathy grade 3 or more, necrotizing enterocolitis, bronchopulmonary dysplasia, intraventricular hemorrhage grade 3 or more, cystic periventricular leukomalacia.eRetinopathy of prematurity grade 3 or more and/or bronchopulmonary dysplasia and/or severe brain injury.