WAIS-III FSIQ and GAI in Ability-Memory Discrepancy Analysis

Laura A. Glass · Jared M. Bartels · Joseph J. Ryan

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Psychological Testing and Assessment Dementia and Cognitive Impairment Research Cognitive Abilities and Testing

Abstract

The present investigation compares WAIS-III FSIQ-WMS-III with GAI-WMS-III discrepancies in 135 male inpatients with suspected memory impairment. Full Scale IQ and GAI scores were highly correlated, r= .96, with mean values of 92.10 and 93.59, respectively. Additional analyses with the ability composites compared to each WMS-III index (IMI, GMI, and DMI), the GAI consistently produced larger difference scores than did the FSIQ; however, effect sizes were relatively small (ES= .12). Lastly, case-by-case analyses demonstrated concordance rates of 86% for the FSIQ-IMI and GAI-IMI comparisons, 85% for the FSIQ-GMI and GAI-GMI, and 82% for the FSIQ-DMI and GAI-DMI.

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1967The correction for spurious correlation in the evaluation of short-form tests 1992Everyday memory performance across the life span: Effects of age and noncognitive individual differences.2001Development of a General Ability Index for the Wechsler Adult Intelligence Scale--Third Edition.2005WAIS-III General Ability Index in neuropsychiatry and forensic psychiatry inpatient samples☆2004Development of a New Delayed Memory Index for the WMS-III 2006Development of WAIS-III General Ability Index Minus WMS-III Memory Discrepancy Scores

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2015A systematic review on WAIS-III's research with a special focus on clinical studies 2022Does high scatter on the Wechsler Adult Intelligence Scale–Fourth Edition general ability index reduce validity in predicting Wechsler Memory Scale–Fourth Edition indexes?

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