Electronic Theses and Dissertations for Graduate School
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Understanding Dimensions and Types of Borderline Personality Disorder Through Factor Mixture Modeling
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Johnson, Benjamin Norman
Master of Science
Date of Defense:
February 23, 2017
Kenneth N. Levy, Thesis Advisor
Michael N. Hallquist, Committee Member
James M. LeBreton, Committee Member
latent variable modeling
latent class analysis
Objective: Borderline personality disorder (BPD) is serious and prevalent and is quite heterogeneous. Identifying subtypes of BPD promises useful diagnostic and treatment implications. Although a series of subtyping studies exist, only two have examined BPD subtypes while taking into account BPD severity. We utilize factor mixture modeling (FMM) to identify discrete BPD subtypes, simultaneously considering symptom severity, in a large nonclinical young adult sample. We also consider how identified subtypes may be reflected in individuals reliably diagnosed with BPD. Method: Undergraduate students (N = 20,010; 63.86% female; mean age=18.75, SD = 1.73) and BPD-diagnosed participants (N = 66; 97% female; mean age = 29.74, SD = 10.94) completed a dimensional version of the McLean Screening Instrument for BPD (MSI-BPD). This was condensed to measure the nine DSM BPD criteria on a True/False scale. We conducted FMM to determine classes of individuals characterized by different responses to the MSI-BPD as well as the composition of underlying BPD severity dimensions. Results: The nonclinical sample was comprised of three subtypes—Asymptomatic (70%), Impulsive/Externalizing (19%), and Identity Disturbed/Internalizing (11%)—falling along a single continuum of increasing BPD severity. In the BPD sample, a single severity dimension best captured BPD symptomatology and no subtypes were identifiable. Conclusions: Our results suggest the importance of both dimensional and categorical conceptualizations of BPD, depending on the sample and level of severity in focus. Impulsive/Externalizing and Identity Disturbed/Internalizing classes suggest different treatment targets for subthreshold BPD and potential etiologically relevant profiles for BPD development. The findings are discussed in terms of their clinical implications regarding diagnosis, treatment, and theoretical conceptualization of BPD.
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