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

J Nurs Meas. 2021 Sep 13:JNM-D-20-00053. doi: 10.1891/JNM-D-20-00053. Online ahead of print.


Background and purpose: The Rasch model has not yet been used to evaluate the Chronic Pain Coping Inventory (CPCI), a tool used worldwide to measure coping with chronic pain.

Objective: Analyze the adjustment of the CPCI-Brazilian version and its scales to the Rasch model.

Methods: CPCI Rasch analysis with 705 outpatients from a Brazilian hospital.

Results: The set of Illness-Focused coping strategies presented as a one-dimensional scale. The Rasch reliability of the person item ranged between 0.33 and 0.89, and 0.29 and 0.99, respectively. There were misfits for items 35 (MNSQOutfit = 2.12) and 54 (MNSQOutfit = 2.92), and DIF of one item regarding gender. The Wright map revealed some gaps in coping measurement.

Conclusions: The scales of CPCIBrazilian Version fitted to the Rasch model after adjustments in the categories of response and exclusion of items 35 and 54.

Keywords: chronic pain; pain measurement; psychological adaptation; psychometrics.