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Development of WAIS-III General Ability Index Minus WMS-III memory discrepancy scores.

Lange RT, Chelune GJ, Tulsky DS

Riverview Hospital, Department of Research, Coquitlam, BC, Canada. rlange@bcmhs.bc.ca

Analysis of the discrepancy between intellectual functioning and memory ability has received some support as a useful means for evaluating memory impairment. In recent additions to Wechlser scale interpretation, the WAIS-III General Ability Index (GAI) and the WMS-III Delayed Memory Index (DMI) were developed. The purpose of this investigation is to develop base rate data for GAI-IMI, GAI-GMI, and GAI-DMI discrepancy scores using data from the WAIS-III/WMS-III standardization sample (weighted N = 1250). Base rate tables were developed using the predicted-difference method and two simple-difference methods (i.e., stratified and non-stratified). These tables provide valuable data for clinical reference purposes to determine the frequency of GAI-IMI, GAI-GMI, and GAI-DMI discrepancy scores in the WAIS-III/WMS-III standardization sample.

Published 9 August 2006 in Clin Neuropsychol, 20(3): 382-95.
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