Copyright © American Speech-Language-Hearing Association From: Typical and Atypical Language Development in Infants and Toddlers Adopted From Eastern Europe Am J Speech Lang Pathol. 2002;11(4):417-433. doi:10.1044/1058-0360(2002/045) Legend: Linear regression lines for mean words on the Language Development Survey (Rescorla, 1989) are shown for each of four age-at-adoption cohorts. Non-Adopted figures are normative data derived from group mean score data in Rescorla and Achenbach (2002). Regression formulas are: Rescorla & Achenbach, 2002: y = 20.333x–32), (0–12 months: y = 21.777x–66.802), (13–18 months: y = 26.826x-178.14), (19–24 months: y = 43.157x–421.6), (25–30 months: y = 43.145x–447.56). Means, ranges, and standard deviations for the data are presented in Tables 2–5. Date of download: 10/7/2017 Copyright © American Speech-Language-Hearing Association