Validation of Posttraumatic Stress Disorder (PTSD) and Complex-PTSD using the International Trauma Questionnaire

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

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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.
Original languageEnglish
Pages (from-to)313-322
Number of pages10
JournalActa Psychiatrica Scandinavica
Issue number3
Early online date11 Jul 2017
Publication statusPublished (in print/issue) - 30 Sept 2017


  • posttraumatic stress disorder (PTSD)
  • complex posttraumatic stress disorder (CPTSD)
  • ICD-11
  • DSM-5
  • stress-related disorders
  • anxiety and depression.


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