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    "title": "The International Trauma Questionnaire: development of a self‐report measure of ICD‐11 PTSD and complex PTSD",
    "authors": [
        "M. Cloitre",
        "M. Shevlin",
        "C. R. Brewin",
        "J. I. Bisson",
        "N. P. Roberts",
        "A. Maercker",
        "T. Karatzias",
        "P. Hyland"
    ],
    "container": "Acta Psychiatrica Scandinavica",
    "year": "2018",
    "doi_url": "https:\/\/doi.org\/10.1111\/acps.12956",
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    "abstract": "OBJECTIVE: The purpose of this study was to finalize the development of the International Trauma Questionnaire (ITQ), a self-report diagnostic measure of post-traumatic 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.",
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