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Visible Learning™
Visible Learning MetaX™
Version 1.3 – Updated November 2024

Adopted vs. non-adopted children

Overview

  • Influence: Adopted vs. non-adopted children
  • Domain: Home
  • Sub-Domain: Family structure
  • Potential to Accelerate Student Achievement: Likely to have positive impact
  • Influence Definition: These studies compare the performance of children who have been adopted with those not adopted.

Evidence

  • Number of meta-analyses: 3
  • Number of studies: 150
  • Number of students: 0
  • Number of effects: 112
  • Weighted mean effect size: 0.21
  • Robustness index: 2

Meta-Analyses

Meta-Analyses
Journal Title Author First Author's Country Article Name Year Published Variable Number of Studies Number of Students Number of Effects Effect Size
Journal of Clinical Child and Adolescent Psychology Wierzbicki USA Psychological adjustment of adoptees: A meta-analysis 1993 Adoptee vs. nonadoptive achievement 66 0 31 0.13
Psychological Bulletin van Ijzendoorn, Juffer, Poelhuis Netherlands Adoption and cognitive development: a meta-analytic comparison of adopted and nonadopted children's IQ and school performance 2005 Nonadopted vs. adopted children 55 0 52 0.19
Journal of Speech, Language, and Hearing Research Scott, Roberts, & Glennen USA How well do children who are internationally adopted acquire language? A meta-analysis 2011 Language skills of internationally adopted children 29 0 29 0.44
TOTAL/AVERAGE 150 0 112 0.25
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