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Factor structure of the expanded Brief Psychiatric Rating Scale

G K Burger1, R J Calsyn, G A Morse

  • 1University of Missouri-St. Louis, Psychology Department 63121-4499, USA.

Journal of Clinical Psychology
|August 1, 1997
PubMed
Summary

This study confirmed the five-factor structure of the expanded Brief Psychiatric Rating Scale (BPRS) in homeless individuals with severe mental illness. However, the Hostility-Suspicion factor showed lower reliability.

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Area of Science:

  • Psychiatry
  • Psychometrics
  • Mental Health Research

Background:

  • The Brief Psychiatric Rating Scale (BPRS) is a widely used tool for assessing psychiatric symptoms.
  • Understanding the factor structure of the expanded BPRS is crucial for accurate symptom assessment in clinical populations.
  • Homeless individuals with severe mental illness represent a vulnerable population requiring reliable assessment tools.

Purpose of the Study:

  • To investigate the factor structure of the expanded Brief Psychiatric Rating Scale (BPRS).
  • To examine the reliability and validity of the BPRS factor structure in a sample of homeless individuals with severe mental illness.

Main Methods:

  • Confirmatory factor analysis (CFA) was employed using the Oblique Multiple Group method.
  • The study sample comprised homeless individuals diagnosed with severe mental illness.

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  • Internal consistency was assessed using Cronbach's alpha coefficients for each factor.

    • Main Results:

    • The confirmatory factor analysis supported a five-factor solution for the expanded BPRS, consistent with previous findings for the original BPRS.
    • The identified factors were: Thinking Disorder, Withdrawal, Anxiety-Depression, Hostility-Suspicion, and Activity.
    • Reliability, indicated by alpha coefficients, was good for four factors (.73–.81) but low for the Hostility-Suspicion factor (.49).

    Conclusions:

    • The expanded BPRS demonstrates a stable five-factor structure in severely mentally ill homeless individuals.
    • While generally reliable, the Hostility-Suspicion subscale may require further investigation or modification for this population.
    • The findings support the continued use of the BPRS for symptom assessment in this clinical group, with a note of caution regarding the Hostility-Suspicion factor.