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Cognitive Therapy and Research

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23.04.2018 | Original Article

Development of the Interpretation Bias Index for PTSD

verfasst von: Joseph W. Boffa, Aaron M. Norr, Jamie L. Tock, Nader Amir, Norman B. Schmidt

Erschienen in: Cognitive Therapy and Research | Ausgabe 5/2018

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Abstract

Cognitive models of posttraumatic stress disorder (PTSD) implicate interpretation biases as a maintaining factor of symptoms. Existing measures index symptoms and negative beliefs in PTSD patients, but not threatening interpretation of socially-ambiguous information, which would further inform cognitive models of PTSD. Here we describe the development of a measure of interpretation bias specific to individuals with PTSD. Studies 1 and 2 utilized analog samples to identify the smallest set of items capable of differentiating PTSD-specific interpretation biases. Study 3 utilized a clinical sample to examine the factor structure of the 9-item Interpretation Bias Index for PTSD (IBIP). A bifactor model fit the IBIP best, comprising a general PTSD factor and two subfactors. The IBIP was most strongly related to PTSD symptoms and demonstrated sensitivity and specificity to detecting true PTSD cases. The IBIP has potential clinical utility for tracking interpretation bias in PTSD, or even screening for PTSD diagnoses.

As an alternative demonstration of discriminant validity, separate hierarchical regression models tested the incremental effect of IBIP total and subscale scores in predicting PSWQ, BDI-II, and PCL-C scores. A similar pattern of results emerged, wherein after controlling for the other two symptom measures in the first step, the IBIP total and ‘hypervigilance/avoidance’ subscale scores contributed the largest amount of additional variance to PCL-C, PSWQ, and BDI-II scores, respectively, but the IBIP ‘intrusions’ subscale contributed unique variance only to PCL-C scores.

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Titel: Development of the Interpretation Bias Index for PTSD
verfasst von: Joseph W. Boffa
Aaron M. Norr
Jamie L. Tock
Nader Amir
Norman B. Schmidt
Publikationsdatum: 23.04.2018
Verlag: Springer US
Erschienen in: Cognitive Therapy and Research / Ausgabe 5/2018
Print ISSN: 0147-5916
Elektronische ISSN: 1573-2819
DOI: https://doi.org/10.1007/s10608-018-9915-8

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