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Assessment
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*Post-Traumatic Stress Disorder
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Utility of the Trauma Symptom Inventory’s Atypical Response Scale in Detecting Malingered Post-Traumatic Stress Disorder

Jon D. Elhai

University of South Dakota

Matthew J. Gray

University of Wyoming

James A. Naifeh

University of South Dakota

Jimmie J. Butcher

University of South Dakota

Joanne L. Davis

University of Tulsa

Sherry A. Falsetti

University of Illinois at Chicago

Connie L. Best

Medical University of South Carolina

The authors examined the Trauma Symptom Inventory’s (TSI) ability to discriminate 88 student post-traumatic stress disorder (PTSD) simulators screened for genuine PTSD from 48 clinical PTSD-diagnosed outpatients. Results demonstrated between-group differences on several TSI clinical scales and the Atypical Response (ATR) validity scale. Discriminant function analysis using ATR revealed 75% correct patient classification but only 48% correct simulator classification, with an overall correct classification rate of 59% (positive predictive power [PPP] = .71; negative predictive power [NPP] = .51). Individual ATR cutoff scores did not yield impressive classification results, with the optimal cutoff (T score = 61) correctly classifying only 61% of simulators and patients (PPP = .66, NPP = .54). Although ATR was not developed as a malingered PTSD screen, instead serving as a general validity screen, caution is recommended in its current clinical use for detecting malingered PTSD.

Key Words: malingering • symptom overreporting • posttraumatic stress disorder • trauma symptom inventory

Assessment, Vol. 12, No. 2, 210-219 (2005)
DOI: 10.1177/1073191105275456
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