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Development of the WAIS-III general ability index estimate ( GAI-E ) . The WAIS-III General Ability Index ( GAI ; Tulsky , Saklofske , Wilkins , & Weiss , 2001 ) is a recently developed , 6-subtest measure of global intellectual functioning . However , clinical use of the GAI is currently limited by the absence of a method to estimate premorbid functioning as measured by this index . The purpose of this study was to develop regression equations to estimate GAI scores from demographic variables and WAIS-III subtest performance . Participants consisted of those subjects in the WAIS-III standardization sample that has complete demographic data ( N=2,401 ) and were randomly divided into two groups . The first group ( n=1,200 ) was used to develop the formulas ( i.e. , Development group ) and the second ( n=1,201 ) group was used to validate the prediction algorithms ( i.e. , Validation group ) . Demographic variables included age , education , ethnicity , gender and region of country . Subtest variables included vocabulary , information , picture completion , and matrix reasoning raw scores . Ten regression algorithms were generated designed to estimate GAI . The GAI-Estimate ( GAI-E ) algorithms accounted for 58 % to 82 % of the variance . The standard error of estimate ranged from 6.44 to 9.57 . The correlations between actual and estimated GAI ranged from r=.76 to r=.90 . These algorithms provided accurate estimates of GAI in the WAIS-III standardization sample . Implications for estimating GAI in patients with known or suspected neurological dysfunction is discussed and future research is proposed .
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Intervention_Other
develop the formulas
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Intervention_Other
validate the prediction algorithms
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Outcome_Mental
GAI scores
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Outcome_Other
WAIS-III subtest performance
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Outcome_Physical
Demographic variables
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Outcome_Physical
age
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ethnicity
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Outcome_Physical
gender
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Outcome_Physical
region of country
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Outcome_Mental
vocabulary
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Outcome_Other
information
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Outcome_Mental
picture completion
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Outcome_Other
matrix reasoning raw scores
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Outcome_Mental
GAI
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Outcome_Physical
GAI-Estimate ( GAI-E ) algorithms