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Updated: May 9, 2025

Decomposing the Variance in Reading Comprehension to Reveal the Unique and Common Effects of Language and Decoding
Published on: October 11, 2018
Combined Language and Code Emergent Literacy Intervention for At-Risk Preschool Children: A Systematic Meta-Analytic
Jennie Cusiter1,2,3, Kate Short1,2,4, Annabel Webb1,5,6
1The University of Sydney, Sydney, New South Wales, Australia.
Abstract:
This meta-analytic review explored the characteristics and effectiveness of combined language (e.g., vocabulary) and code (e.g., phonological awareness) interventions, including synergistic intervention effects for at-risk preschoolers. Data from 29 randomized controlled trials, published before March 2023, reporting on 43 interventions, including 9333 children (4-6 years; 55% male, 45% African American, 30% Hispanic) were included in the meta-analyses. Composite intervention effects were small: language (g = 0.11) and code (g = 0.23). Language and code outcomes were significantly related (p = 0.032). Interventions equally targeting code and language subskills produced equivalent or greater code and language outcomes than those with an unequal emphasis. Implications for future combined intervention studies are discussed.
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