Utility of the trauma symptom inventory's atypical response scale in detecting malingered post-traumatic stress disorder |
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Authors: | Elhai Jon D Gray Matthew J Naifeh James A Butcher Jimmie J Davis Joanne L Falsetti Sherry A Best Connie L |
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Institution: | Disaster Mental Health Institute, University of South Dakota, Vermillion 57069-2390, USA. jonelhai@hotmail.com |
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Abstract: | 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. |
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