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Measuring PTSD and CPTSD Using the Newly Developed ICD-TQ: Reliability & Validity in Two UK Samples

Karatzias, Thanos, Shevlin, Mark, Hyland, Philip, Fyvie, Claire, Roberts, Neil, Bisson, Jonathan I., Brewin, Chris R., Jumbe, Sandra, Downes, Anthony and Cloitre, Marylène (2017) Measuring PTSD and CPTSD Using the Newly Developed ICD-TQ: Reliability & Validity in Two UK Samples. In: ISTSS 33rd Annual Meeting Trauma and Complexity: From Self to Cells., 9th-11th November 2017, Palmer House Hilton, Chicago, Illinois, USA. (Submitted)

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Objective: International Classification of Diseases version 11 (ICD-11) proposals include a narrow model of Posttraumatic Stress Disorder (PTSD) comprised of six symptoms reflecting three factors: (1) Re-experiencing in the here and now, (2) avoidance, and (3) sense of current threat. It is proposed that a sibling diagnosis, Complex PTSD (CPTSD), will also be included and will comprise PTSD symptoms plus ‘Disturbances in Self- Organization’ (DSO) symptoms. DSO reflects three factors: Affective Dysregulation, Negative Self- Concept, and Disturbances in Relationships. This paper reports on the validity and reliability of ICD-11 Trauma Questionnaire (ICD-TQ), a self-report measure of PTSD and CPTSD, from two studies in Scotland and Wales.

Method: Participants were two trauma exposed samples in Scotland (N = 193) and Wales (N = 171). Participants in the Scottish sample completed measures of traumatic life events, DSM-5 PTSD, emotion dysregulation, self–esteem, and interpersonal difficulties. Participants in the Welsh sample completed measures of life events, DSM-5 PTSD, depression, GAD and panic disorder, posttraumatic cognitions and emotion regulation.

Results: In both samples, a two-factor second-order model reflecting the distinction between PTSD and CPTSD best represented the data from the ICD-TQ. Confirmatory factor analysis supported the factorial validity of the ICD-TQ with results in line with ICD- 11 proposals. The ICD-TQ also demonstrated satisfactory internal reliability, and correlation results indicated that the scale exhibited convergent and discriminant validity. In the Welsh sample, rates of ICD-11 PTSD and CPTSD were significantly lower than DSM-5 PTSD. In the Scottish sample, CPTSD was more strongly associated with more frequent and a greater accumulation of different types of childhood traumatic experiences and poorer functional impairment. In the Welsh sample, PTSD symptoms, but not Disturbances in Self-organisation (DSO) associated with CPTSD, positively predicted levels of Panic Disorder; whereas DSO symptoms, but not PTSD, positively predicted levels of depression, levels of negative cognitions about the self and the world, and negatively predicted levels of distress tolerance. PTSD and DSO were both significant, positive predictors of GAD symptoms, but it was PTSD that was a stronger predictor than DSO.

Conclusion: Results provide support for the psychometric properties of the ICD-TQ. Findings also suggest that ICD 11 diagnoses fewer trauma- exposed individuals than DSM 5. Future theoretical and empirical work will be required to generate a final version of the ICD-TQ that will match the diagnostic structure of PTSD and CPTSD when ICD 11 is published.

Item Type: Conference or Workshop Item (Paper)
Subjects: B Philosophy. Psychology. Religion > Psychology
B Philosophy. Psychology. Religion > Psychology > Stress (Psychology) > Post-traumatic stress disorder
B Philosophy. Psychology. Religion > Psychology > Stress (Psychology)
Divisions: School of Business > Staff Research and Publications
Depositing User: Caoimhe Ní Mhaicín
Date Deposited: 15 Nov 2017 16:43
Last Modified: 15 Nov 2017 16:48

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