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Disparities in mentally retarded persons' IQs derived from different intelligence tests.

H H Spitz

    American Journal of Mental Deficiency
    |March 1, 1986
    PubMed
    Summary

    The Wechsler Adult Intelligence Scale-Revised (WAIS-R) overestimates IQ scores for individuals with mild to moderate intellectual disabilities due to flawed standardization. Recommendations include improving sampling methods rather than discarding IQ testing.

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    Area of Science:

    • Psychometrics
    • Intelligence Testing
    • Developmental Psychology

    Background:

    • The Wechsler Adult Intelligence Scale-Revised (WAIS-R) is a widely used measure of adult intelligence.
    • Previous versions and other intelligence scales have shown varying results for individuals with intellectual disabilities.
    • Concerns exist regarding the accuracy and standardization of intelligence tests for specific populations.

    Purpose of the Study:

    • To evaluate the performance of the Wechsler Adult Intelligence Scale-Revised (WAIS-R) in individuals with mild to moderate intellectual disabilities.
    • To compare WAIS-R scores with other established intelligence scales for this population.
    • To identify potential issues with the standardization and scoring of the WAIS-R.

    Main Methods:

    • Comparative analysis of intelligence quotient (IQ) scores obtained from the WAIS-R.

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  • Comparison with scores from the Wechsler Adult Intelligence Scale (WAIS), Wechsler children's scales, and Stanford-Binet Intelligence Scale, Form L-M.
  • Examination of intertest correlations and standardization sampling adequacy.

    • Main Results:

    • The WAIS-R measures intelligence similarly to the WAIS in individuals with mild to moderate intellectual disabilities.
    • The WAIS-R yields significantly higher IQ scores compared to Wechsler children's scales and the Stanford-Binet Intelligence Scale, Form L-M.
    • High intertest correlations were observed despite score discrepancies.

    Conclusions:

    • The current standardization sampling of the WAIS-R is inadequate, particularly for the lower range of intellectual functioning.
    • The observed overestimation of IQ scores in individuals with intellectual disabilities is a significant concern.
    • Corrective actions for standardization are recommended to maintain the utility of IQ scores.