“…The IHDP was a randomized clinical trial that tested the efficacy of educational and family support services in reducing the incidence of developmental delays in LBW (2,500 g or less), preterm infants (37 weeks or less gestational age; Brooks-Gunn, Klebanov, Liaw, & Spiker, 1993;Gross, Spiker, & Haynes, 1997;Infant Health and Development Program, 1990). Infants were screened for eligibility if they were 40 weeks postconceptional age between January 7, 1985 and October 9, 1985, and were born in one of the eight participating medical institutions (University of Arkansas for Medical Sciences at Little Rock, Albert Einstein College of Medicine; Harvard University Medical School; Miami University School of Medicine; University of Pennsylvania School of Medicine; University of Texas Health Science Center at Dallas; University of Washington School of Medicine at Seattle; and Yale University School of Medicine).…”