Revealing what is distinct by recognising what is common: distinguishing between complex PTSD and Borderline Personality Disorder symptoms using bifactor modelling

Rachel Frost*, Jamie Murphy, Philip Hyland, Mark Shevlin, Menachem Ben-Ezra, Maj Hansen, Cherie Armour, Angela McCarthy, Twylla Cunningham, Tracey McDonagh

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

2 Citations (Scopus)
24 Downloads (Pure)

Abstract

Background: Despite concerns of conceptual similarity, increasing evidence supports the discriminant validity of Complex Posttraumatic Stress Disorder (CPTSD) and Borderline Personality Disorder (BPD). However, all studies to date have assumed a categorical model of psychopathology. In contrast, dimensional models of psychopathology, such as the Hierarchical Taxonomy of Psychopathology model (i.e. HiTOP model), recognise shared vulnerability across supposedly discrete disorders. Accounting for shared vulnerability between CPTSD and BPD symptoms may help to better reveal what is unique about these constructs. Objective: To identify the distinct and shared features of CPTSD and BPD via the application of dimensional modelling procedures. Method: Confirmatory bifactor and confirmatory factor analysis were employed to identify the optimal latent structure of CPTSD and BPD symptoms amongst a convenience sample of Israeli adults (N = 617). Additionally, structural equation modelling was used to identify risk factors associated with these constructs. Results: The latent structure of CPTSD and BPD symptoms was best explained by a bifactor model including one ‘general’ factor (i.e. vulnerability to all symptoms) and three ‘specific’ correlated factors (i.e. vulnerability to PTSD, DSO, and BPD symptoms, respectively). CPTSD symptoms were more readily distinguished from the general factor whereas BPD symptoms were not as easily distinguished from the general factor. CPTSD symptoms reflecting a negative self-concept and BPD symptoms reflecting an alternating self-concept were the most distinctive features of CPTSD and BPD relative to the general factor, respectively. Most of the risk factors were associated with the general vulnerability factor, consistent with the predictions of dimensional models of psychopathology regarding shared risk across supposedly distinct psychiatric constructs. Conclusion: Consistent with a dimensional model of psychopathology, CPTSD and BPD shared a common latent structure but were still distinguishable. CPTSD and BPD symptoms may be most effectively distinguished based on the phenomenology of self-concept symptoms.

Original languageEnglish
Article number1836864
Number of pages11
JournalEuropean Journal of Psychotraumatology
Volume11
Issue number1
DOIs
Publication statusPublished - 18 Dec 2020

Bibliographical note

Funding Information:
This research has received funding from the European Union?s Horizon 2020 research and innovation programme as part of CONTEXT project (http://www.psychotraumanetwork.com) under the Marie Sk?odowska-Curie [grant agreement No 722523].

Publisher Copyright:
© 2020 The Author(s). Published by Informa UK Limited, trading as Taylor & Francis Group.

Copyright:
Copyright 2020 Elsevier B.V., All rights reserved.

Keywords

  • borderline personality disorder
  • complex PTSD
  • ICD-11
  • Posttraumatic stress disorder
  • trauma

ASJC Scopus subject areas

  • Psychiatry and Mental health

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