Assessing the factorial validity and the internal reliability of the International Trauma Questionnaire (ITQ); PTSD and complex PTSD among survivors of sexual violence in Ireland

R Frost, M Lousion Vang, P Hyland, M Shevlin, A McCarthy, J Murphy

Research output: Contribution to journalArticlepeer-review

Abstract

AIMS: To assess the factorial validity and internal reliability of the International Trauma Questionnaire (ITQ) among a treatment-seeking sample of survivors of sexual violence in Ireland. In addition, to assess the diagnostic rate of post-traumatic stress disorder (PTSD) and complex post-traumatic stress disorder (CPTSD) among the samples.

METHODS: Participants were adult survivors of sexual violence ( N = 114) in receipt of therapeutic support at the Dublin Rape Crisis Centre. The ITQ was utilised to measure PTSD and CPTSD symptoms and confirmatory factor analysis was employed to assess the factorial validity of the ITQ. Composite reliability was employed to assess the internal reliability of the ITQ scale scores.

RESULTS: The confirmatory factor analysis results indicated that a six-factor correlated model and a two-factor higher model were good representations of the latent structure of the ITQ, both models are consistent with the conceptualisation of CPTSD. All ITQ subscales possessed satisfactory internal reliability except for the affective dysregulation subscale. Of the sample, 56.1% met the criteria for CPTSD and 20.2% met the criteria for PTSD.

CONCLUSIONS: The ITQ captured a distinction between PTSD and CPTSD symptoms and produced reliable scores within the sample, but replication with a larger sample size is required. In addition, the study findings demonstrated that CPTSD was relatively common among those seeking psychological support following sexual violence.

Original languageEnglish
Article numbere42
Number of pages5
JournalEpidemiology and Psychiatric Sciences
Volume31
Early online date17 Jun 2022
DOIs
Publication statusE-pub ahead of print - 17 Jun 2022

Bibliographical note

Funding Information:
This study was funded by the Europeans Union's Horizon 2020 research and innovation programme under the Marie Sklodowska-Curie Actions, Grant Agreement No. 722523.

Publisher Copyright:
Copyright © The Author(s), 2022.

Keywords

  • Post-traumatic stress disorder
  • sexual assault
  • trauma
  • validation study
  • International Classification of Diseases
  • Reproducibility of Results
  • Ireland/epidemiology
  • Humans
  • Survivors
  • Sex Offenses
  • Adult
  • Surveys and Questionnaires
  • Stress Disorders, Post-Traumatic/diagnosis
  • Stress Disorders, Post-Traumatic
  • Sexual Assault
  • Validation Study
  • Trauma
  • Ireland
  • Post-traumatic Stress Disorder

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