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Related Experiment Videos

Symptom structure in obsessive-compulsive disorder: a confirmatory factor-analytic study.

L J Summerfeldt1, M A Richter, M M Antony

  • 1Psychology Department, St. Joseph's Hospital, Hamilton, Ontario, Canada. Isummerf@stjosham.on.ca

Behaviour Research and Therapy
|April 16, 1999
PubMed
Summary

Obsessive-compulsive disorder (OCD) symptoms show heterogeneity, with a four-factor model fitting best at a broader level. However, no single model fully captures the complexity of individual OCD symptoms.

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Area of Science:

  • Psychiatry
  • Clinical Psychology
  • Behavioral Science

Background:

  • Obsessive-compulsive disorder (OCD) has historically been viewed as a singular diagnosis.
  • Recent research suggests potential heterogeneity within OCD, possibly due to distinct symptom subgroups.

Purpose of the Study:

  • To evaluate existing models of OCD symptom structure.
  • To determine the best fit for understanding OCD heterogeneity using confirmatory factor analysis.

Main Methods:

  • Examined four models (single-factor, two-factor, three-factor, and four-factor) of OCD symptom structure.
  • Utilized confirmatory factor analysis on data from 203 individuals with OCD, assessing individual symptoms and a priori groupings.
  • Data collected using the Yale-Brown Obsessive Compulsive Scale symptom checklist.

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Main Results:

  • Only the four-factor model demonstrated adequate fit at the second-order level, identifying subgroups: obsessions/checking, symmetry/ordering, contamination/cleaning, and hoarding.
  • This four-factor model did not adequately account for the relationships among discrete OCD symptoms.
  • Significant heterogeneity was observed within factors, alongside overlap between factors, particularly checking and contamination-related symptoms.

Conclusions:

  • Evidence supports the multidimensional nature of OCD symptoms.
  • Current models, including those based on overt behavioral similarities, are insufficient for a comprehensive understanding of OCD.
  • Further research is needed to identify a more complete model of OCD symptom structure.