Assessing Cognitive Outcomes in Studies of Extreme Prematurity

* Abbreviation: EP — : extremely premature In this issue of Pediatrics , O’Reilly et al1 report on neuropsychological outcomes at 19 years of age after extremely preterm (EP) birth using the 1995 EPICure birth cohort of infants born EP (50% loss to follow-up, O’Reilly et al1 provide compelling evidence for persistent effects of general cognitive impairments in their impressive longitudinal studies of EP birth to emerging adulthood. These findings are generally consistent with … Address correspondence to Louis A. Schmidt, PhD, Department of Psychology, Neuroscience, and Behaviour, McMaster University, Hamilton, ON L8S 4K1, Canada. E-mail: schmidtl{at}mcmaster.ca