Measuring obsessive-compulsive symptoms: Padua Inventory-Revised vs. Yale-Brown Obsessive Compulsive Scale

Area of Science:

• Psychiatry
• Clinical Psychology
• Neuroscience

Background:

• The Yale-Brown Obsessive Compulsive Scale (Y-BOCS) and Padua Inventory-Revised (PI-R) are leading instruments for assessing obsessive-compulsive disorder (OCD) symptoms.
• A surprisingly low correlation exists between these two widely used OCD assessment tools.

Purpose of the Study:

• To investigate two potential explanations for the low correlation between the Y-BOCS and PI-R.
• To compare the Y-BOCS and PI-R in 120 OCD patients to test specific hypotheses.

Main Methods:

• Comparison of Y-BOCS and PI-R in 120 patients diagnosed with OCD.
• Testing hypotheses related to administration differences (observer-rated vs. self-rated).
• Testing hypotheses related to severity calculation methods (symptom aggregation vs. symptom-independent severity).

Main Results:

• Neither the administration method nor the severity calculation method adequately explained the low correlation between the Y-BOCS and PI-R.
• The investigation found that the two scales measure distinct features of OCD.

Conclusions:

• The Y-BOCS and PI-R appear to capture relatively unrelated aspects of obsessive-compulsive disorder.
• The findings suggest that using multiple assessment measures is advisable for a comprehensive understanding of OCD phenomena.