Concurrent validity of a WAIS--R seven-subtest short form in patients with brain impairment.

Grant L. Iverson · Bill Myers · Michelle L. Bengston · Russell L. Adams

18 citations0/0 files storedPsychological Assessment

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Psychological Testing and Assessment Psychometric Methodologies and Testing Cognitive Abilities and Testing

Abstract

The concurrent validity of a Wechsler Adult Intelligence Scale-Revised (WAIS-R) seven-subtest short form was examined in 138 patients with closed-head injuries and 49 patients with presumed dementia. In patients with closed-head injuries, the average short form IQ score was within 1 point of the actual Verbal, Performance, and Full Scale IQ (VIQ, PIQ, and FSIQ) scores. The validity coefficients for these patients ranged from.90 to.95. In patients with presumed dementia, the short form underestimated the average VIQ by nearly 5 points and the average FSIQ by 3.5 points. However, the validity coefficients for these patients were uniformly high (.91 to to.95 ). Examination of the frequency distributions revealed that there was a percentage of patients whose short form IQs and actual IQs were highly discrepant. Research designed to determine the variables that reduce the accuracy of the short form in clinical populations is needed.

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References

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1999Validity, reliability, and standard errors of measurement for two seven-subtest short forms of the Wechsler Adult Intelligence Scale--III.1999A Comparison of Nine WAIS-R Short Forms in Individuals with Mild to Severe Traumatic Brain Injury 2000Short-Form Prediction of WAIS-R Scores in a Sample of Individuals Diagnosed With Multiple Sclerosis 1997The Future of Neuropsychology in Medical Specialties

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