Sadjadi, Reza (36572565400)Reza (36572565400)SadjadiPeric, Stojan (35750481700)Stojan (35750481700)PericGwathmey, Kelly (52263846500)Kelly (52263846500)GwathmeyBozovic, Ivo (57194468421)Ivo (57194468421)BozovicAleksa, Palibrk (57219547834)Palibrk (57219547834)AleksaBjelica, Bogdan (57194461405)Bogdan (57194461405)BjelicaBurns, Ted (7201807227)Ted (7201807227)BurnsBasta, Ivana (8274374200)Ivana (8274374200)Basta2025-07-022025-07-022021https://doi.org/10.1002/mus.27089https://www.scopus.com/inward/record.uri?eid=2-s2.0-85093831737&doi=10.1002%2fmus.27089&partnerID=40&md5=aa8a2f05a86a6e4ad1469359cd95d2e7https://remedy.med.bg.ac.rs/handle/123456789/12404Background: We studied the performance of a 15-item, health-related quality-of-life polyneuropathy scale in a longitudinal study of patients with chronic inflammatory demyelinating polyneuropathy (CIDP). Methods: Sixty-one patients with CIDP completed the Chronic Acquired Polyneuropathy Patient-Reported Index (CAPPRI) scale and Patient Impression of Change (PIC) at baseline and follow-up visits. Clinicians completed Inflammatory Neuropathy Cause and Treatment (INCAT) disability scores at baseline and follow-up visits. Conventional and modern psychometric analyses were performed on the completed forms. Results: CAPPRI was psychometrically stable between visits without significant difference in response pattern between visits 1 and 2 (paired t-test P =.72). There was strong correlation between changes in INCAT and changes in CAPPRI scores between two visits (rho = 0.6, P <.001). In addition, we showed robust CAPPRI effect sizes between PIC categories. Conclusions: We demonstrated psychometric stability and construct longitudinal validity of CAPPRI. © 2020 Wiley Periodicals LLCchronic inflammatory demyelinating polyneuropathylongitudinaloutcome measurespsychometricsRasch analysis