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Brief psychiatric rating scale expanded version: How do new items affect factor structure?

Dawn Velligan1, Thomas Prihoda, Ellen Dennehy

  • 1Department of Psychiatry, University of Texas Health Sciences Center at San Antonio, Mail Stop 7792, 7703 Floyd Curl Drive, San Antonio, TX 78229-3900, USA. velligand@uthscsa.edu

Psychiatry Research
|July 5, 2005
PubMed
Summary

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This summary is machine-generated.

The Brief Psychiatric Rating Scale Expanded Version (BPRS-E) demonstrates a stable four-factor structure, enhancing its utility as a reliable clinical outcome measure for psychiatric assessment.

Area of Science:

  • Psychiatry
  • Psychometric Evaluation
  • Clinical Assessment

Background:

  • The 18-item Brief Psychiatric Rating Scale (BPRS) has been a long-standing tool in clinical psychiatric research.
  • The Brief Psychiatric Rating Scale Expanded Version (BPRS-E) was developed to improve upon the original scale.
  • A robust factor structure for the BPRS-E is needed for reliable clinical application.

Purpose of the Study:

  • To propose a factor structure for the BPRS-E using a large, diverse psychiatric outpatient sample.
  • To identify new items in the BPRS-E that enhance established factors from the 18-item BPRS.
  • To assess the stability of the proposed BPRS-E factor structure over time and across demographic variables.

Main Methods:

  • Exploratory and confirmatory factor analysis were performed on data from 1440 psychiatric outpatients in the Texas Medication Algorithm Project.

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  • The sample was randomly split for exploratory and confirmatory analyses.
  • The BPRS-E was administered multiple times to assess consistency.

    • Main Results:

    • A stable four-factor structure for the BPRS-E was identified, encompassing depression/anxiety, psychosis, negative symptoms, and activation.
    • Specific items within the BPRS-E were found to broaden existing factors while maintaining or improving model fit and reliability.
    • The proposed four-factor model demonstrated consistency across time, diagnostic groups, illness phase, age, gender, ethnicity, and education level.

    Conclusions:

    • The Brief Psychiatric Rating Scale Expanded Version (BPRS-E) possesses a reliable and stable four-factor structure.
    • This validated structure supports the BPRS-E's use as a valuable clinical outcome measure in psychiatric research and practice.
    • The BPRS-E offers improved assessment capabilities compared to the traditional 18-item BPRS.