Shevlin, Mark and Hyland, Philip and Roberts, Neil P. and Bisson, Jonathan I. and 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). p. 1419749. ISSN 2000-8066

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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
Additional Information:	© 2018 The Author(s). Published by Informa UK Limited, trading as Taylor & Francis Group. This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. Cite as: Mark Shevlin, Philip Hyland, Neil P. Roberts, Jonathan I. Bisson, Chris R Brewin & Marylene Cloitre (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, DOI: 10.1080/20008198.2017.1419749
Keywords:	ICD-11 PTSD; ICD-11 Complex PTSD; Disturbances in Self-Organization (DSO); item response theory;
Academic Unit:	Faculty of Science and Engineering > Psychology
Item ID:	12651
Identification Number:	https://doi.org/10.1080/20008198.2017.1419749
Depositing User:	Philip Hyland
Date Deposited:	23 Mar 2020 15:30
Journal or Publication Title:	European Journal of Psychotraumatology
Publisher:	Taylor & Francis Open
Refereed:	Yes
URI:	https://www.tandfonline.com/
Use Licence:	This item is available under a Creative Commons Attribution Non Commercial Share Alike Licence (CC BY-NC-SA). Details of this licence are available here

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