A Rasch Analysis of the Chronic Pain Coping Inventory-Brazilian Version

Area of Science:

• Psychometrics
• Pain Management
• Health Psychology

Background:

• The Chronic Pain Coping Inventory (CPCI) is a globally utilized tool for assessing chronic pain coping mechanisms.
• The Rasch model, a key psychometric tool, has not been previously applied to evaluate the CPCI.

Purpose of the Study:

• To assess the psychometric properties of the CPCI-Brazilian version using the Rasch model.
• To determine the unidimensionality and item fit of the CPCI scales within the Rasch measurement framework.

Main Methods:

• Rasch analysis was performed on data from 705 outpatients at a Brazilian hospital.
• Item fit, reliability (person and item), and differential item functioning (DIF) were evaluated.

Main Results:

• The Illness-Focused coping strategies scale demonstrated unidimensionality.
• Reliability estimates for persons and items were within acceptable ranges, though some items showed misfit (items 35 and 54).
• One item exhibited DIF related to gender, and the Wright map indicated measurement gaps.

Conclusions:

• The CPCI-Brazilian version scales generally fit the Rasch model.
• Adjustments, including category modifications and exclusion of misfit items (35 and 54), improved the model fit.
• The findings support the validity of the adjusted CPCI-Brazilian version for measuring chronic pain coping.