Reliability of a standardized and expanded Brief Psychiatric Rating Scale: a replication study

Area of Science:

• Psychiatry
• Psychometrics
• Clinical Psychology

Background:

• The Brief Psychiatric Rating Scale-Expanded (BPRS-E) is a widely used tool for assessing psychiatric symptom severity.
• Previous psychometric evaluations have established its reliability, but replication is crucial for validation.

Purpose of the Study:

• To replicate interrater reliability coefficients of the BPRS-E from a 1991 study.
• To assess the intrarater reliability of the BPRS-E.
• To determine the reliability of specific BPRS-E subscales and items in a contemporary clinical setting.

Main Methods:

• Replication of a 1991 psychometric evaluation of the BPRS-E.
• Assessment of interrater and intrarater reliability coefficients.
• Analysis of reliability at both item and subscale levels, including the anxiety-depression subscale and psychotic disintegration scale.

Main Results:

• Most BPRS-E items showed satisfactory interrater concordance, but few achieved acceptable chance-corrected coefficients.
• The anxiety-depression subscale, 10-item psychotic disintegration scale, and BPRS-18 global scores met acceptable interrater reliability standards.
• The 6 additional BPRS-E items did not enhance scale reliability, and combining samples did not improve interrater reliability.

Conclusions:

• The anxiety-depression subscale, 10-item psychotic disintegration scale, and BPRS-18 global scale are reliable for use with unselected psychiatric inpatients.
• Clinicians should exercise caution when interpreting scores from other BPRS-E items or the full scale in acute distress populations.
• Replication confirms the utility of specific BPRS-E components for reliable psychiatric symptom assessment.