Stanford-Binet and WAIS IQ differences and their implications for adults with intellectual disability (aka mental retardation)

Wayne Silverman; Charles Miezejeski; Robert Ryan; Warren Zigman; Sharon Krinsky-McHale; Tiina Urv

doi:10.1016/j.intell.2009.12.005

Stanford-Binet and WAIS IQ differences and their implications for adults with intellectual disability (aka mental retardation)

Wayne Silverman, Charles Miezejeski, Robert Ryan, Warren Zigman, Sharon Krinsky-McHale, Tiina Urv

Research output: Contribution to journal › Article › peer-review

24 Scopus citations

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.

Original language	English (US)
Pages (from-to)	242-248
Number of pages	7
Journal	Intelligence
Volume	38
Issue number	2
DOIs	https://doi.org/10.1016/j.intell.2009.12.005
State	Published - Mar 2010
Externally published	Yes

Keywords

IQ
Intellectual disability
Intelligence testing

ASJC Scopus subject areas

Experimental and Cognitive Psychology
Developmental and Educational Psychology
Arts and Humanities (miscellaneous)

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10.1016/j.intell.2009.12.005

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title = "Stanford-Binet and 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.",

keywords = "IQ, Intellectual disability, Intelligence testing",

author = "Wayne Silverman and Charles Miezejeski and Robert Ryan and Warren Zigman and Sharon Krinsky-McHale and Tiina Urv",

note = "Funding Information: The authors thank the many participants, agencies and agency staff who have supported our Aging Research Program throughout the many years of its existence. We also thank our staff for their many indispensable contributions: T. Bach, S. Briffa-Mirabella, A. Camper, D. Conlon-Borsak, M. Dabbene, D. Grandjean, L. Gonzalez, L. Kullman, C. Lawrence, C. Marino, B. Myrhol, K. Olsen, G. Palma, D. Pang, J. Russo, C. Stolzenthaler, D. Swift, A. Trzeciak, M. Tsepilovan, and S. Vietze. This work was supported by funds provided by New York State through its Office of Mental Retardation and Developmental Disabilities, as well as grants PO1 HD035897 and P30 HD024061 from the Eunice Kennedy Shriver National Institute of Child Health and Human Development .",

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AU - Silverman, Wayne

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AU - Ryan, Robert

AU - Zigman, Warren

AU - Krinsky-McHale, Sharon

AU - Urv, Tiina

N1 - Funding Information: The authors thank the many participants, agencies and agency staff who have supported our Aging Research Program throughout the many years of its existence. We also thank our staff for their many indispensable contributions: T. Bach, S. Briffa-Mirabella, A. Camper, D. Conlon-Borsak, M. Dabbene, D. Grandjean, L. Gonzalez, L. Kullman, C. Lawrence, C. Marino, B. Myrhol, K. Olsen, G. Palma, D. Pang, J. Russo, C. Stolzenthaler, D. Swift, A. Trzeciak, M. Tsepilovan, and S. Vietze. This work was supported by funds provided by New York State through its Office of Mental Retardation and Developmental Disabilities, as well as grants PO1 HD035897 and P30 HD024061 from the Eunice Kennedy Shriver National Institute of Child Health and Human Development .

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N2 - 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.

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Stanford-Binet and WAIS IQ differences and their implications for adults with intellectual disability (aka mental retardation)

Abstract

Keywords

ASJC Scopus subject areas

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