A psychometric assessment of disturbances in self-organization symptom indicators for ICD-11 complex PTSD using the International Trauma Questionnaire

Shevlin, Mark, Hyland, Philip, Roberts, Neil, Bisson, Jonathan ORCID: https://orcid.org/0000-0001-5170-1243, Brewin, Chris R and Cloitre, Marylene 2018. A psychometric assessment of disturbances in self-organization symptom indicators for ICD-11 complex PTSD using the International Trauma Questionnaire. European Journal of Psychotraumatology 9 (1) , 1419749. 10.1080/20008198.2017.1419749

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Abstract

Background: Two ‘sibling disorders’ have been proposed for the 11th version of the International Classification of Diseases (ICD-11): Posttraumatic Stress Disorder (PTSD) and Complex PTSD (CPTSD). To date, no research has attempted to identify the optimal symptom indicators for the ‘Disturbances in Self-Organization’ (DSO) symptom cluster. Objective: The aim of the current study was to assess the psychometric performance of scores of 16 potential DSO symptom indicators from the International Trauma Questionnaire (ITQ). Criteria relating to score variability and their ability to discriminate were employed. Method: Participants (N = 1839) were a nationally representative household sample of non-institutionalized adults currently residing in the US. Item scores from the ITQ were examined in relation to basic criteria associated with interpretability, variability, homogeneity, and association with functional impairment. The performance of the DSO symptoms was also assessed using 1- and 2-parameter item response theory (IRT) models. Results: The distribution of responses for all DSO indicators met the criteria associated with interpretability, variability, homogeneity, and association with functional impairment. The 1-parameter graded response model was considered the best model and indicated that each set of indictors performed very similarly. Conclusions: The ITQ contains 16 DSO symptom indicators and they perform well in measuring their respective symptom cluster. There was no evidence that particular indicators were ‘better’ than others, and it was concluded that the indicators are essentially interchangeable.

Item Type:	Article
Date Type:	Publication
Status:	Published
Schools:	Medicine MRC Centre for Neuropsychiatric Genetics and Genomics (CNGG)
Publisher:	Co-Action Publishing
ISSN:	2000-8198
Date of First Compliant Deposit:	31 January 2018
Date of Acceptance:	23 November 2017
Last Modified:	07 May 2023 12:49
URI:	https://orca.cardiff.ac.uk/id/eprint/108621

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