Association between maximal serum non-conjugated bilirubin level and non-optimal neurological outcome at 2-year corrected age (n = 631).

Pregnancy characteristics included prenatal corticosteroid treatment, multiple pregnancies, hypertension during pregnancy, premature rupture of membranes >24 h and cesarean section. Mother characteristics included health insurance for low financial income and upper socio-demographic level. Infant characteristics included GA, birthweight, small for GA and gender. Neonatal hospitalization characteristics included surfactant therapy, maternofetal sepsis, nosocomial sepsis, bronchopulmonary dysplasia, hemodynamic failure and patent ductus arteriosus requiring treatment.