Reliability and validity of the Yale-Brown Obsessive-Compulsive Scale

Area of Science:

• Psychiatry
• Clinical Psychology
• Psychometrics

Background:

• The Yale-Brown Obsessive-Compulsive Scale (YBOCS) is a widely used clinical rating scale for obsessive-compulsive disorder (OCD).
• Assessing the psychometric properties of the YBOCS is crucial for its accurate application in research and clinical practice.
• Previous studies have established the YBOCS as a valuable tool, but ongoing evaluation is necessary.

Purpose of the Study:

• To evaluate the reliability and validity of the Yale-Brown Obsessive-Compulsive Scale (YBOCS) using a multi-trait multi-method approach.
• To identify potential improvements to the YBOCS by examining specific items and exploring new ones.

Main Methods:

• A multi-trait multi-method approach was employed with 54 outpatients diagnosed with obsessive-compulsive disorder (OCD).
• Internal consistency, inter-rater reliability, and test-retest reliability were assessed.
• Convergent and divergent validity were examined against other OCD and depression measures.

Main Results:

• Internal consistency was acceptable and improved by deleting items on resistance to obsessions/compulsions.
• Inter-rater reliability was excellent, but test-retest reliability was lower than desired.
• The YBOCS showed good convergent validity with OCD measures but poor divergent validity with depression; an avoidance item improved the scale.

Conclusions:

• The YBOCS is a reliable and valid measure for OCD, with excellent inter-rater reliability.
• Recommendations for a revised 9-item YBOCS include deleting resistance items and adding an avoidance item for enhanced clinical utility.
• Further research should incorporate these revisions to optimize the YBOCS for assessing OCD severity.