title: Stanford-Binet & WAIS IQ Differences and Their Implications for Adults with Intellectual Disability (aka Mental Retardation).
abstract: Stanford-Binet and Wechsler Adult Intelligence Scale (WAIS) IQs were compared for a group of 74 adults with intellectual disability (ID). In every case, WAIS Full Scale IQ was higher than the Stanford-Binet Composite IQ, with a mean difference of 16.7 points. These differences did not appear to be due to the lower minimum possible score for the Stanford-Binet. Additional comparisons with other measures suggested that the WAIS might systematically underestimate severity of intellectual impairment. Implications of these findings are discussed regarding determination of disability status, estimating prevalence of ID, assessing dementia and aging-related cognitive declines, and diagnosis of ID in forensic cases involving a possible death penalty.
authors.affiliation: Department of Behavioral Psychology, Kennedy Krieger Institute, and Department of Psychiatry and Behavioral Sciences, Johns Hopkins University School of Medicine.
authors.forename: Wayne
authors.initials: W
authors.lastname: Silverman
authors.forename: Charles
authors.initials: C
authors.lastname: Miezejeski
authors.forename: Robert
authors.initials: R
authors.lastname: Ryan
authors.forename: Warren
authors.initials: W
authors.lastname: Zigman
authors.forename: Sharon
authors.initials: S
authors.lastname: Krinsky-McHale
authors.forename: Tiina
authors.initials: T
authors.lastname: Urv
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