Psychometric Properties of the International Trauma Interview (ITI) for ICD-11 PTSD and CPTSD

Study Overview
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Brief Summary
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The aim of the project is to evaluate the psychometric properties (e.g. validity, reliability) of the International Trauma Interview (ITI) - German version. The ITI is a structured clinical interview that corresponds to the ICD-11 criteria for diagnosing both posttraumatic stress disorder (PTSD) and complex posttraumatic stress disorder (CPTSD). Eligible participants from psychiatric inpatient and outpatient facilities in Switzerland who have provided informed will complete various self-report measures about trauma-related mental health complaints. In addition, the ITI will be conducted by a trained clinician. Lastly, information from the medical chart will be further used for scientific purpose. The overall assessment will take approximately 1-2 hours to complete.

Official Title
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Psychometric Properties of the International Trauma Interview (ITI) for ICD-11 PTSD and CPTSD

Conditions
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Post Traumatic Stress Disorder (PTSD), Complex Post-Traumatic Stress Disorder (CPTSD)

Intervention / Treatment
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* Diagnostic Test: International Trauma Interview (ITI) for ICD-11 PTSD and Complex PTSD - German version


Participation Criteria
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Eligibility Criteria
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Study-specific Inclusion criteria Structured diagnostic procedures upon hospital entry not yet started, except for orienting assessments Able to give informed consent as documented by signature Able to understand and communicate in German Exclusion criteria Clinical signs for impaired cognitive abilities Other contraindications to undergo the clinical interview

Ages Eligible for Study
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Minimum Age: 18 Years
Maximum Age: 99 Years

Sexes Eligible for Study
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All

Accepts Healthy Volunteers
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No

Study Plan
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How is the study designed?
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Design Details

Primary Purpose: Diagnostic
Intervention Model: Single Group Assignment
Masking: None (Open Label)


Arms and Interventions

| Participant Group/Arm | Intervention/Treatment |
| --- | --- |
| Other: International Trauma Interview (ITI)<br> | Diagnostic Test: International Trauma Interview (ITI) for ICD-11 PTSD and Complex PTSD - German version<br>* The ITI consists of 18 items and for each symptom, standardized questions as well as probes are presented. A trained professional rates both symptom frequency and intensity, which are converted into an overall index of symptom severity. A diagnosis of PTSD/CPTSD is established by applying the ICD-11 diagnostic rules. It takes approximately 30-60 minutes to administer.<br>|

What is the study measuring?
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Primary Outcome Measures

| Outcome Measure | Measure Description | Time Frame |
| --- | --- | --- |
| International Trauma Interview (ITI) |  | Up to two weeks upon psychiatric ward entry | 
| Life Event Checklist DSM-5 |  | Up to two weeks upon psychiatric ward entry | 

Secondary Outcome Measures

| Outcome Measure | Measure Description | Time Frame |
| --- | --- | --- |
| Beck Depression Inventory II |  | Up to seven days upon psychiatric ward entry | 
| Brief Symptom Checklist |  | Up to seven days upon psychiatric ward entry | 
| Impact of Event Scale Revised Version |  | Up to seven days upon psychiatric ward entry | 
| PTSD Checklist for DSM-5 |  | Up to seven days upon psychiatric ward entry | 
| Borderline Symptom List |  | Up to seven days upon psychiatric ward entry |