OBJECTIVE: To determine whether exposure to antenatal corticosteroid therapy was associated with adverse effects on growth, sensorineural outcome, or lung function of children of birth weight <1501 g at 14 years of age. DESIGN: Cohort study. SETTING: The Royal Women's Hospital, Melbourne, Australia. SUBJECTS: One hundred fifty-four consecutive survivors born from October 1, 1980 to March 31, 1982. INTERVENTIONS: The mothers of 78 survivors (51%) had been given corticosteroids antenatally to accelerate fetal lung maturation. Treatment with antenatal corticosteroids was nonrandom. No mother received >1 course of corticosteroids. OUTCOME MEASURES: The children were assessed at 14 years of age, corrected for prematurity. All assessors were unaware of the exposure of the child to antenatal corticosteroids. The assessments included measurements of growth and neurological, cognitive, and lung function. Growth measurements were converted into z scores (standard deviation) for the appropriate age and gender. RESULTS: Of the 154 survivors, 130 (84%) were assessed at 14 years of age. Overall, the children exposed to antenatal corticosteroids were significantly taller (height z score; mean difference:.39; 95% confidence interval:.001-. 79) and had better cognitive functioning (Wechsler Intelligence Scale for Children-Third Edition Full Scale; IQ mean difference: 6. 2; 95% confidence interval:.8-11.6) than those not exposed to corticosteroids. There were no other differences in sensorineural outcomes between the groups. Lung function was not significantly different between the groups. No conclusions were altered by adjustment for confounding variables. CONCLUSIONS: Exposure to 1 course of antenatal corticosteroid therapy was associated with some clinically and statistically improved outcomes at 14 years of age in children of birth weight <1501 g, with no obvious adverse effects on growth or on sensorineural, cognitive, or lung function. corticosteroids, growth, cognitive, IQ, lung function, adolescence.