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Cloitre M, et al. The International Trauma Questionnaire: development of a self-report measure of ICD-11 PTSD and complex PTSD. Acta Psychiatr Scand. 2018;138(6):536-546. PMID 30178492

One-paragraph summary

The study developed the self-report ITQ for ICD-11 PTSD and CPTSD using item-response analysis in a UK trauma-exposed community sample (n=1,051) and clinical sample (n=247), followed by factor/validity testing.

Key findings

  • The optimized instrument contains 12 symptom items covering ICD-11 PTSD and disturbances in self-organisation.
  • It operationalized the sibling-diagnosis proposal rather than translating a DSM-5 scale.
  • Its development enabled subsequent cross-population latent-profile and validation work.

Limitations

  • Self-report diagnosis is not identical to structured clinical interview.
  • Initial samples were UK-based; thresholds and performance require population-specific validation.
  • Factor separation does not prove distinct aetiology or treatment response.

Why it matters

This record changed the evidentiary baseline for international trauma questionnaire development; later claims should begin from this result rather than earlier narrative consensus.

Cited by wiki pages

  • diagnosis-and-classification
  • complex-ptsd
  • comorbidity