Sustained Effects of High Participation in an Early Intervention for Low-Birth-Weight Premature Infants

Jennifer L. Hill, Jeanne Brooks-Gunn, Jane Waldfogel

Research output: Contribution to journalArticle

Abstract

Effects of high participation in the Infant Health and Development Program (IHDP), an 8-site randomized trial that targeted low-birth-weight (LBW) premature infants (N = 1,082), were estimated. Children in the treatment group were offered high-quality center-based care in their 2nd and 3rd years of life (full-day care, 50 weeks per year). High-dosage effects were estimated with a new methodology that found a matched comparison group within the follow-up group for those with high participation rates; these estimates were compared with traditional intention-to-treat (ITT) estimates. At age 8, effects on the Wechsler Intelligence Scale for Children Full and Verbal scales for children who attended > 400 days ranged from 7 to 10 points. For the heavier LBW infants (2,001-2,500 g), the effects were about 14 points for > 400 days; for the lighter LBW infants (≤ 2,000 g), the effects were about 8 points. These effects were all substantially higher than corresponding ITT effects. Similar but smaller effects were found for children who attended > 350 days.

Original languageEnglish (US)
Pages (from-to)730-744
Number of pages15
JournalDevelopmental psychology
Volume39
Issue number4
DOIs
StatePublished - Jul 2003

ASJC Scopus subject areas

  • Demography
  • Developmental and Educational Psychology
  • Life-span and Life-course Studies

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