INTERNATIONAL TRAUMA QUESTIONNAIRES (ITQ)

Self-report measures of ICD-11 PTSD and Complex PTSD

ITQ Questionnaire

INTERNATIONAL TRAUMA QUESTIONNAIRE (ITQ)

The International Trauma Questionnaire (ITQ) is a brief, simply worded measure, focusing only on the core features of PTSD and CPTSD, and employs straightforward diagnostic rules.

The ITQ was developed to be consistent with the organizing principles of the ICD-11, as set forth by the World Health Organization, which are to maximize clinical utility and ensure international applicability through a focus on the core symptoms of a given disorder.

The ITQ is freely available in the public domain to all interested parties. A version for use with people with intellectual and other developmental disabilities is also available.

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International Trauma Questionnaire Child and Adolescent Version (ITQ-CA)

This International Trauma Questionnaire Child and Adolescent Version (ITQ-CA) is a brief, simply-worded measure of Posttraumatic Stress Disorder and Complex Posttraumatic Stress Disorder symptoms for use with people aged 7 to 17 years.

As with the International Trauma Questionnaire, the ITQ-CA was developed to be consistent with the organizing principles of the ICD-11, as set forth by the World Health Organization, which are to maximize clinical utility and ensure international applicability through a focus on the core symptoms of a given disorder.

The ITQ-CA is freely available in the public domain to all interested parties. A Caregiver-Report Version is also available.

ITQ-CA Questionnaire

ITQ-CC Questionnaire

International Trauma Questionnaire with Clinical Checks (ITQ-CC)

The International Trauma Questionnaire (ITQ) is the most widely used tool for assessing ICD-11 PTSD and CPTSD, typically via self-reports or structured interviews—each with strengths and limitations.

Self-reports are quick and cost-effective but prone to misinterpretation, while structured interviews offer clarity but are time-consuming and costly. To bridge this gap, researchers developed 'clinical checks'—follow-up questions that verify understanding of key clinical elements.

That’s why the International Trauma Questionnaire with Clinical Checks (ITQ-CC) was created—to combine the efficiency of self-reports with the reliability of interviews, enhancing accuracy while remaining practical for large-scale use. The ITQ-CC is freely available in the public domain.

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Find out more

Key Publications

ITQ

Hyland, P., Karatzias, T., Shevlin, M., McElroy, E., Ben-Ezra, M., Cloitre, M., & Brewin, C. R. (2021). Does requiring trauma exposure affect rates of ICD-11 PTSD and complex PTSD? Implications for DSM–5. Psychological Trauma: Theory, Research, Practice, and Policy, 13(2), 133–141. https://doi.org/10.1037/tra0000908

Redican, E., Nolan, E., Hyland, P., Cloitre, M., McBride, O., Karatzias, T., Murphy, J., & Shevlin, M. (2021). A systematic literature review of factor analytic and mixture models of ICD-11 PTSD and CPTSD using the International Trauma Questionnaire. Journal of Anxiety Disorders, 79, 102381. https://doi.org/10.1016/j.janxdis.2021.102381

Hyland, P., Brewin, C. R., Cloitre, M., Karatzias, T., & Shevlin, M. (2024). Responding to concerns related to the measurement of ICD-11 complex posttraumatic stress disorder using the International Trauma Questionnaire. Child Abuse & Neglect, 147, 106563. https://doi.org/10.1016/j.chiabu.2023.106563

ITQ-CA

Sölva, K., Haselgruber, A., & Lueger-Schuster, B. (2023). Resilience in the face of adversity: classes of positive adaptation in trauma-exposed children and adolescents in residential care. BMC Psychology, 11(1), 30. https://doi.org/10.1186/s40359-023-01049-x

Haselgruber, A., Knefel, M., Sölva, K., & Lueger-Schuster, B. (2021). Foster children's complex psychopathology in the context of cumulative childhood trauma: The interplay of ICD-11 complex PTSD, dissociation, depression, and emotion regulation. Journal of Affective Disorders, 282, 372–380. https://doi.org/10.1016/j.jad.2020.12.116

Bruckmann, P., Haselgruber, A., Sölva, K., & Lueger-Schuster, B. (2020). Comparing rates of ICD-11 and DSM-5 Posttraumatic Stress Disorder in Austrian children and adolescents in foster care: prevalence, comorbidity and predictors. European Journal of Psychotraumatology, 11(1), 1767988. https://doi.org/10.1080/20008198.2020.1767988

Haselgruber, A., Sölva, K., & Lueger-Schuster, B. (2020). Validation of ICD-11 PTSD and complex PTSD in foster children using the International Trauma Questionnaire. Acta Psychiatrica Scandinavica, 141(1), 60–73. https://doi.org/10.1111/acps.13100

Haselgruber, A., Sölva, K., & Lueger-Schuster, B. (2020). Symptom structureof ICD-11 Complex Posttraumatic Stress Disorder (CPTSD) in trauma-exposed foster children: examining the International Trauma Questionnaire – Child and Adolescent Version (ITQ-CA). European Journal of Psychotraumatology, 11:1, 1818974, DOI: 10.1080/20008198.2020.1818974

Sölva, K., Haselgruber, A., & Lueger-Schuster, B. (2020). Latent classes of childhood maltreatment in children and adolescents in foster care: associationswith ICD-11 PTSD and complex PTSD. European Journal of Psychotraumatology, 11:1, 1832757,DOI: 10.1080/20008198.2020.1832757

ITQ-CC

Shevlin, M., Hyland, P., Brewin, C. R., Cloitre, M., Karatzias, T., & Redican, E. (2025). Testing the use of ‘clinical checks’ with the International Trauma Questionnaire to measure PTSD and complex PTSD. Acta Psychiatrica Scandinavica.