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

Cloitre, M.; Shevlin, M.; Brewin, C. R.; Bisson, J. I.; Roberts, N. P.; Maercker, A.; Karatzias, T.; Hyland, P.


M. Cloitre

M. Shevlin

C. R. Brewin

J. I. Bisson

N. P. Roberts

A. Maercker

P. Hyland


Objective: The purpose of this study was to finalize the development of the International Trauma Questionnaire (ITQ); a self-report diagnostic measure of Posttraumatic 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.


Cloitre, M., Shevlin, M., Brewin, C. R., Bisson, J. I., Roberts, N. P., Maercker, A., …Hyland, P. (2018). The International Trauma Questionnaire: development of a self-report measure of ICD-11 PTSD and complex PTSD. Acta Psychiatrica Scandinavica, 138(6), 536-546.

Journal Article Type Article
Acceptance Date Aug 13, 2018
Online Publication Date Sep 3, 2018
Publication Date 2018-12
Deposit Date Aug 14, 2018
Publicly Available Date Sep 3, 2018
Journal Acta psychiatrica Scandinavica
Print ISSN 0001-690X
Publisher Wiley
Peer Reviewed Peer Reviewed
Volume 138
Issue 6
Pages 536-546
Keywords PTSD; psychometrics; public mental health,
Public URL

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