Articlehybrid2018

The International Trauma Questionnaire: development of a self‐report measure of ICD‐11 PTSD and complex PTSD

Marylène Cloître · Mark E. Shevlin · Chris R. Brewin · Jonathan I. Bisson · Neil P. Roberts · Andreas Maercker +2 more

1,313 citations0/0 files storedActa Psychiatrica Scandinavica

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Posttraumatic Stress Disorder Research Sleep and related disorders Anxiety, Depression, Psychometrics, Treatment, Cognitive Processes

Abstract

OBJECTIVE: The purpose of this study was to finalize the development of the International Trauma Questionnaire (ITQ), a self-report diagnostic measure of post-traumatic stress disorder (PTSD) and complex PTSD (CPTSD), as defined in the 11th version of the International Classification of Diseases (ICD-11). METHOD: The optimal symptom indicators of PTSD and CPTSD were identified by applying item response theory (IRT) analysis to data from a trauma-exposed community sample (n = 1051) and a trauma-exposed clinical sample (n = 247) from the United Kingdom. The validity of the optimized 12-item ITQ was assessed with confirmatory factor analyses. Diagnostic rates were estimated and compared to previous validation studies. RESULTS: The latent structure of the 12-item, optimized ITQ was consistent with prior findings, and diagnostic rates of PTSD and CPTSD were in line with previous estimates. CONCLUSION: The ITQ is a brief, simply worded measure of the core features of PTSD and CPTSD. It is consistent with the organizing principles of the ICD-11 to maximize clinical utility and international applicability through a focus on a limited but central set of symptoms. The measure is freely available and can be found in the body of this paper.

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References

2013Diagnostic and Statistical Manual of Mental Disorders 1999Cutoff criteria for fit indexes in covariance structure analysis: Conventional criteria versus new alternatives 2015The Posttraumatic Stress Disorder Checklist for DSM‐5 (PCL‐5): Development and Initial Psychometric Evaluation 2005Disorders of extreme stress: The empirical foundation of a complex adaptation to trauma 1987"How Big Is Big Enough?": Sample Size and Goodness of Fit in Structural Equation Models with Latent Variables 2015The development of the ICD-11 Clinical Descriptions and Diagnostic Guidelines for Mental and Behavioural Disorders

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