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Discrepancy Between Predicted and Obtained WAIS–R IQ Scores Discriminates Between Traumatic Brain Injury and Insufficient Effort

Discrepancy Between Predicted and Obtained WAIS–R IQ Scores Discriminates Between Traumatic Brain... This study examines how well the discrepancy between predicted and obtained Wechsler Adult Intelligence Scale—Revised (WAIS–R) scores discriminate between insufficient effort (IE) and traumatic brain injury (TBI). The 27 IE patients performed significantly more poorly on the WAIS–R than the 48 moderate-severe TBI patients. Premorbid IQs were calculated with formulae that use demographics (Barona Index) or demographics and WAIS–R performance (Best-3 and the Oklahoma Premorbid Intelligence Estimation). Predictions were similar on the Barona, but IE patients’ predicted IQs were lower than TBIs for measures with a performance component. IE patients demonstrated a greater discrepancy score (i.e., predicted IQ − obtained IQ) than TBIs; variable levels of sensitivity and specificity were obtained when discriminate functions were developed on these scores. The potential advantage of using discrepancy scores versus performance-based measures to detect insufficient effort is discussed. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Psychological Assessment American Psychological Association

Discrepancy Between Predicted and Obtained WAIS–R IQ Scores Discriminates Between Traumatic Brain Injury and Insufficient Effort

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Publisher
American Psychological Association
Copyright
Copyright © 2001 American Psychological Association
ISSN
1040-3590
eISSN
1939-134X
DOI
10.1037/1040-3590.13.2.240
Publisher site
See Article on Publisher Site

Abstract

This study examines how well the discrepancy between predicted and obtained Wechsler Adult Intelligence Scale—Revised (WAIS–R) scores discriminate between insufficient effort (IE) and traumatic brain injury (TBI). The 27 IE patients performed significantly more poorly on the WAIS–R than the 48 moderate-severe TBI patients. Premorbid IQs were calculated with formulae that use demographics (Barona Index) or demographics and WAIS–R performance (Best-3 and the Oklahoma Premorbid Intelligence Estimation). Predictions were similar on the Barona, but IE patients’ predicted IQs were lower than TBIs for measures with a performance component. IE patients demonstrated a greater discrepancy score (i.e., predicted IQ − obtained IQ) than TBIs; variable levels of sensitivity and specificity were obtained when discriminate functions were developed on these scores. The potential advantage of using discrepancy scores versus performance-based measures to detect insufficient effort is discussed.

Journal

Psychological Assessment – American Psychological Association

Published: Jun 1, 2001

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