Validation of the International Trauma Interview (ITI) for the Clinical Assessment of ICD-11 Posttraumatic Stress Disorder (PTSD) and Complex PTSD (CPTSD) in a Lithuanian Sample

Gelezelyte, Odeta; Roberts, Neil P.; Kvedaraite, Monika; Bisson, Jonathan I.; Brewin, Chris R.; Cloitre, Marylene; Kairyte, Agniete; Karatzias, Thanos; Shevlin, Mark; Kazlauskas, Evaldas

Abstract

Background: The 11th revision of the International Classification of Diseases (ICD-11) includes a new diagnosis of complex posttraumatic stress disorder (CPTSD). The International Trauma Interview (ITI) is a novel clinician-administered diagnostic interview for the assessment of ICD-11 PTSD and CPTSD.
Objective: The aim of this study was to evaluate the psychometric properties of the ITI in a Lithuanian sample in relation to interrater agreement, latent structure, internal reliability, as well as convergent and discriminant validity.
Method: In total, 103 adults with a history of various traumatic experiences participated in the study. The sample was predominantly female (83.5%), with a mean age of 32.64 years (SD = 9.36). For the assessment of ICD-11 PTSD and CPTSD, the ITI and the self-report International Trauma Questionnaire (ITQ) were used. Mental health indicators, such as depression, anxiety, and dissociation, were measured using self-report questionnaires. The latent structure of the ITI was evaluated using confirmatory factor analysis (CFA). In order to test the convergent and discriminant validity of the ITI we conducted a structural equation model (SEM).
Results: Overall, based on the ITI, 18.4% of participants fulfilled diagnostic criteria for PTSD and 21.4% for CPTSD. A second-order two-factor CFA model of the ITI PTSD and disturbances in self-organization (DSO) symptoms demonstrated a good fit. The associations with various mental health indicators supported the convergent and discriminant validity of the ITI. The clinician-administered ITI and self-report ITQ had poor to moderate diagnostic agreement across different symptom clusters.
Conclusion: The ITI is a reliable and valid tool for assessing and diagnosing ICD-11 PTSD and CPTSD.

Citation

Gelezelyte, O., Roberts, N. P., Kvedaraite, M., Bisson, J. I., Brewin, C. R., Cloitre, M., Kairyte, A., Karatzias, T., Shevlin, M., & Kazlauskas, E. (2022). Validation of the International Trauma Interview (ITI) for the Clinical Assessment of ICD-11 Posttraumatic Stress Disorder (PTSD) and Complex PTSD (CPTSD) in a Lithuanian Sample. European Journal of Psychotraumatology, 13(1), Article 2037905. https://doi.org/10.1080/20008198.2022.2037905

• Journal Article Type: Article
• Acceptance Date: Jan 21, 2022
• Online Publication Date: Feb 23, 2022
• Publication Date: 2022
• Deposit Date: Jan 24, 2022
• Publicly Available Date: Feb 23, 2022
• Journal: European Journal of Psychotraumatology
• Print ISSN: 2000-8198
• Electronic ISSN: 2000-8066
• Publisher: Co-Action Publishing
• Peer Reviewed: Peer Reviewed
• Volume: 13
• Issue: 1
• Article Number: 2037905
• DOI: https://doi.org/10.1080/20008198.2022.2037905
• Keywords: International Trauma Interview, posttraumatic stress disorder, complex posttraumatic stress disorder, assessment, ICD-11
• Public URL: http://researchrepository.napier.ac.uk/Output/2837072