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.
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