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.

Abstract

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.

Citation

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. https://doi.org/10.1111/acps.12956

• 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
• DOI: https://doi.org/10.1111/acps.12956
• Keywords: PTSD; psychometrics; public mental health,
• Public URL: http://researchrepository.napier.ac.uk/Output/1274597