Mortality and Neonatal Morbidity Among Infants 501 to 1500 Grams From 2000 to 2009

To identify changes in mortality and neonatal morbidities for infants with birth weight 501 to 1500 g born from 2000 to 2009.

There were 355806 infants weighing 501 to 1500 g who were born in 2000-2009. Mortality during initial hospitalization and major neonatal morbidity in survivors (early and late infection, chronic lung disease, necrotizing enterocolitis, severe retinopathy of prematurity, severe intraventricular hemorrhage, and periventricular leukomalacia) were assessed by using data from 669 North American hospitals in the Vermont Oxford Network.