Characteristics of the Children and Their Families.

* These data are for the 57 children with adequate information for the ascertainment of survival without neurodevelopmental impairment at 2 years corrected age.† Severe bronchopulmonary dysplasia was defined as oxygen treatment for at least 28 days plus physiologic need for ≥30% oxygen and/or positive pressure at 36 weeks post-menstrual age.§ White matter injury was defined as the finding of any of the following on cranial ultrasound or brain MRI closest to 36 weeks postmenstrual age: cystic periventricular leukomalacia, porencephalic cyst, parenchymal hemorrhage, and/or ventriculomegaly (with or without intraventricular hemorrhage).** These data exclude 9 children in the hydrocortisone group and 12 children in the placebo group who died before 18 to 22 months corrected age.¶ These data exclude mothers of 9 children in the hydrocortisone group and 12 children in the placebo group who died before 18 to 22 months corrected age. Race was self-reported.€ Data unavailable for one hydrocortisone and one placebo-treated infant.Characteristics of the Children and Their Families.