Journal
APPLIED PSYCHOLINGUISTICS
Volume 32, Issue 1, Pages 69-92Publisher
CAMBRIDGE UNIV PRESS
DOI: 10.1017/S0142716410000299
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This paper investigated the predictive ability of expressive vocabulary size and lexical composition at age 2 on later language and literacy skills from ages 3 through 11. Multivariate analysis of co-variance was performed to compare 16 language and literacy outcomes between children with large expressive vocabulary size at 24 months (N = 1,073) and those with smaller expressive vocabulary size. Comparisons between large and small verb size groups as a measure of lexical composition were also conducted. Our findings indicate that, after controlling for gender, birth order, ethnicity and socioeconomic status, total vocabulary size at age 2 can significantly predict subsequent language and literacy achievement up to fifth grade. Moreover, vocabulary size is a better predictor of later language ability than lexical composition.
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