title: Age of peers and early childhood development.
abstract: We examined the developmental trajectories of 59 children between 21 and 67 months of age randomly assigned to same-age or mixed-age child care groups. Children were assessed at 6-month intervals with the Battelle Developmental Inventory. Using a hierarchical linear model for analysis, we computed individual and group growth curves for overall development and development within 5 domains: communication, cognitive, motor, adaptive, and personal-social. Group assignment affected the developmental trajectories for communication, cognitive, motor, and overall development, with mixed-age children showing a quadratic trajectory and same-age children a linear trajectory. For adaptive and personal-social development, however, the trajectories were similar. Across all domains, the mixed-age children tended to score higher than the same-age children at the younger ages, but these average differences decreased over time and had disappeared by age 5 years.
authors.affiliation: Frank Porter Graham Child Development Center, University of North Carolina, Chapel Hill 27599.
authors.forename: D B
authors.initials: DB
authors.lastname: Bailey
authors.forename: M R
authors.initials: MR
authors.lastname: Burchinal
authors.forename: R A
authors.initials: RA
authors.lastname: McWilliam
mesh_terms: D000367:Age Factors; D002657:Child Development; D002675:Child, Preschool; D003071:Cognition; D003142:Communication; D005260:Female; D006801:Humans; D007223:Infant; D007398:Interpersonal Relations; D007804:Language Development; D008137:Longitudinal Studies; D008297:Male; D008913:Minority Groups; D010379:Peer Group