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

Marylène Cloitre, M Shevlin, C. R. Brewin, Jonathan I Bisson, N Roberts, Andreas Maercker, Thanos Karatzias, Philip Hyland

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Abstract

Objective:
The 11th version of the International Classification of Diseases (ICD-11) has proposed two related trauma diagnoses: Post-traumatic 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 studywill (i) assess the factorial validity of ICD-11 PTSD and CPTSD; (ii) provide the first test of the discriminant validity of these constructs; and (iii) 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)536-546
Number of pages11
JournalActa Psychiatrica Scandinavica
Volume138
Issue number6
Early online date3 Sep 2018
DOIs
Publication statusE-pub ahead of print - 3 Sep 2018

Keywords

  • ICD-11 PTSD and CPTSD
  • International Trauma Questionnaire
  • validation

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