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Chronic Acquired Polyneuropathy Patient Reported Index (CAPPRI) in chronic inflammatory demyelinating
Bogdan Bjelica1, Stojan Peric1, Kelly Gwathmey2
1Neurology Clinic, Clinical Center of Serbia, School of Medicine, University of Belgrade, Belgrade, Serbia.
Abstract:
To date there are only two validations on the Chronic Acquired Polyneuropathy Patient-Reported Index (CAPPRI) questionnaire, both originated from the North America. We sought to translate and validate CAPPRI for use in Serbian patients with chronic inflammatory demyelinating polyradiculoneuropathy (CIDP). We included 109 CIDP patients. CAPPRI, short form (36) health survey (SF-36), Medical Research Council Sum Score (MRC-SS), Inflammatory Neuropathy Cause and Treatment (INCAT) sensory and disability scores, Beck Depression Inventory (BDI), and Krupp's Fatigue Severity Scale (FSS) were used. Serbian CAPPRI questionnaire was understandable and the language was appropriate and simple. Calculation demonstrated good person (0.9) and item (0.9) reliability with adequate item (4.1), and person (2.9) separation indices. There was a minor floor effect (13.8%), and no ceiling effect. All items had good fit, except items 2 (pain), 5 (sleeping), and 14 (eating) to some degree. Category responses were well ordered and organized, except item 14 (eating). The CAPPRI score did not vary regarding gender, age, or education. Patients with worse scores on MRC-SS, INCAT sensory score, INCAT disability score, FSS, and BDI had worse scores on CAPPRI (P < .01). The CAPPRI score showed strong correlation with the SF-36 score (rho = -0.76, P < .01). The Serbian version of the CAPPRI is reliable and valid patient-reported index for patients with CIDP, able to differentiate between levels of impairment and disability in this disease.
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