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Related Experiment Videos

Discriminating among diagnostic categories using the Dissociative Disorders Interview Schedule.

Colin A Ross1, Joan Weathersbee Ellason

  • 1The Colin A. Ross Institute for Psychological Trauma, The University of Texas at Arlington, USA. rossinst@rossinst.com

Psychological Reports
|June 9, 2005
PubMed
Summary

Dissociative identity disorder is a distinct diagnostic category. Data confirm it is statistically separate from other dissociative and nondissociative disorders.

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Area of Science:

  • Psychiatry
  • Clinical Psychology
  • Psychopathology

Background:

  • Dissociative disorders are complex mental health conditions.
  • Distinguishing dissociative identity disorder (DID) from other diagnoses is crucial for effective treatment.
  • Previous research has explored the boundaries between different dissociative disorders.

Purpose of the Study:

  • To statistically validate dissociative identity disorder as a discrete diagnostic category.
  • To examine the relationship between dissociative identity disorder and other dissociative and nondissociative disorders.
  • To test specific hypotheses regarding diagnostic distances.

Main Methods:

  • Administered the Dissociative Disorders Interview Schedule to 1,308 subjects across eight diagnostic categories.

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  • Included 296 subjects diagnosed with dissociative identity disorder.
  • Utilized Mahalanobis distance to assess statistical separation between diagnostic groups.

    • Main Results:

    • Confirmed that dissociative identity disorder is statistically distant from seven other diagnostic categories.
    • Found dissociative disorder not otherwise specified to be the closest category to dissociative identity disorder.
    • Demonstrated that nondissociative diagnostic categories are closer to each other than to dissociative identity disorder.

    Conclusions:

    • The findings provide strong statistical support for dissociative identity disorder as a distinct taxon.
    • This research reinforces the validity of current diagnostic criteria for dissociative identity disorder.
    • Understanding these diagnostic boundaries is essential for accurate clinical assessment and research.