Fact · Accessibility and health
0.47effect size
In the 2005 meta-analysis, the overall effect size for verbal storage working memory in children with ADHD was 0.47.
Checked against its source on October 16, 2026
In the source's own words
“verbal storage (effect size = 0.47, confidence interval = 0.36-0.59)”
A meta-analysis of working memory impairments in children with attention-deficit/hyperactivity disorder, Ron Martinussen et al., Journal of the American Academy of Child and Adolescent Psychiatry, 2005, Results.
Open the original (DOI 10.1097/01.chi.0000153228.72591.73)- What it measures
- Verbal storage tasks ask people to hold a short list of words or digits in memory, such as repeating a string of numbers back.
- What it does not show
- This is a group average from laboratory tasks. The authors call for more research to define the nature and severity of the deficits.