International Trauma Interview (ITI) Standardisation and Validation
Research type
Research Study
Full title
Towards the validation of the International Trauma Interview (ITI) for the IDC-11 diagnoses of Post-Traumatic Stress Disorder and Complex Post-Traumatic Stress disorder, and the role of core beliefs
IRAS ID
285376
Contact name
Thanos Karatzias
Contact email
Sponsor organisation
Edinburgh Napier University
Duration of Study in the UK
2 years, 2 months, 1 days
Research summary
Research Summary
This study aims to provide an initial validation of the English International Trauma Interview (ITI) and explore its psychometric properties and clinical utility. Secondary aims include clarification around the relationship between maladaptive schemas and the development of complex post-traumatic stress disorder (CPTSD) symptoms later in life and to identify which schemas predict the diagnosis of post-traumatic stress disorder (PTSD) and CPTSD.
The ITI is a two-part semi-structured interview protocol consisting of items relating to symptoms of PTSD and disorders of social organisation (DSO). The first part is based on the Clinician-Administered PTSD Scale for DSM-5 (CAPS-5) and uses six items to assess the three symptom clusters commonly related to PTSD (re-experiencing, avoidance, and hypervigilance). The second part of the ITI relates to DSO, again consisting of six total items evaluating three symptom clusters (affect dysregulation, negative self-concept, and interpersonal difficulties). The results of this interview schedule can be interpreted to provide a suggested diagnosis of either PTSD, CPTSD, or non-clinically significant symptoms.
Participants will be recruited from outpatient facilities participating in the study. ITQ, demographics and information on schemas will be collected as self-report measures to be completed prior to a virtual meeting with the researcher. The meeting will take place via Attend Anywhere software. Clinicians from participating facilities will be asked to refer suitable clients. If the client agrees to participate, an appointment will be arranged for the participant to meet with the researcher virtually.
A small number of participants will be invited to attend a second virtual meeting with the researcher, where the ITI will be administered for a second time, to facilitate the assessment of test-retest reliability. Another group of participants audiotaped, and the recordings rated by trained clinicians who will assign a diagnosis. This will enable the analysis of inter-rater reliability.
Summary of Results
We aimed to research the use of a new diagnostic tool for post-traumatic stress disorder (PTSD) and complex PTSD (CPTSD). We did not recruit as many participants as we wanted to, but overall our results show that the diagnostic tool gives reliable assessments of symptoms. The assessment tool we researched was compared to another diagnostic tool and the results from both were similar for each person. Indicating that the new assessment tool does accurately diagnose PTSD and CPTSD.
REC name
West of Scotland REC 1
REC reference
21/WS/0027
Date of REC Opinion
23 Mar 2021
REC opinion
Further Information Favourable Opinion