Journal
CHILD NEUROPSYCHOLOGY
Volume 13, Issue 6, Pages 528-538Publisher
ROUTLEDGE JOURNALS, TAYLOR & FRANCIS LTD
DOI: 10.1080/09297040701233875
Keywords
neuropsychology; pediatric neuropsychology; norms; sample sizes
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The purpose of this investigation was to determine how confidence intervals (CIs) for pediatric neuropsychological norms vary as a function of sample size, and to determine optimal sample sizes for normative studies. First, the authors calculated 95% CIs for a set of published pediatric norms for four commonly used neuropsychological instruments. Second, 95% CIs were calculated for varying sample size (from n = 5 to n = 500). Results suggest that some pediatric norms have unacceptably wide CIs, and normative studies ought optimally to use 50 to 75 participants per cell. Smaller sample sizes may lead to over-pathologizing results, while the cost of obtaining larger samples may not be justifiable.
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