Validation of post-traumatic stress disorder (PTSD) and complex PTSD using the International Trauma Questionnaire

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

Abstract

Objective: The 11th version of the International Classification of Diseases (ICD-11) has proposed two related trauma diagnoses: Posttraumatic Stress Disorder (PTSD) and Complex PTSD (CPTSD). Using a newly developed, disorder-specific measure of PTSD and CPTSD called the International Trauma Questionnaire (ITQ) the current study will: (1) assess the factorial validity of ICD-11 PTSD and CPTSD; (2) provide the first test of the discriminant validity of these constructs; and (3) provide the first comparison of ICD-11, and Diagnostic and Statistical Manual, Fifth Edition (DSM-5), PTSD diagnostic rates using disorder-specific measures.
Method: ICD-11 and DSM-5 PTSD specific measures were completed by a British clinical sample of trauma-exposed patients (N = 171). The structure and validity of ICD-11 PTSD and CPTSD were assessed by means of factor analysis and assessing relationships with criterion variables.
Results: Diagnostic rates under ICD-11 were significantly lower than those under DSM-5. A two-factor second-order model reflecting the distinction between PTSD and CPTSD best represented the data from the ITQ; and the PTSD and CPTSD factors differentially predicted multiple psychological variables.
Conclusion: The factorial and discriminant validity of ICD-11 PTSD and CPTSD was supported, and ICD-11 produces fewer diagnostic cases than DSM-5.

• Journal Article Type: Article
• Acceptance Date: Jun 19, 2017
• Online Publication Date: Jul 11, 2017
• Publication Date: 2017-09
• Deposit Date: Jun 20, 2017
• Publicly Available Date: Jul 12, 2018
• Journal: Acta Psychiatrica Scandinavica
• Print ISSN: 0001-690X
• Publisher: Wiley
• Peer Reviewed: Peer Reviewed
• Volume: 136
• Issue: 3
• Pages: 313-322
• DOI: https://doi.org/10.1111/acps.12771
• Keywords: posttraumatic stress disorder (PTSD); complex posttraumatic stress disorder (CPTSD); ICD-11; DSM-5; stress-related disorders; anxiety and depression
• Public URL: http://researchrepository.napier.ac.uk/Output/949677
• Contract Date: Jun 20, 2017