Adaptation and crosscultural validation of the Foot Impact Scale for Rheumatoid Arthritis using Rasch analysis.

Arthritis Care & Research
James WoodburnMartijn P M Steultjens

Abstract

To adapt and crossculturally validate the Foot Impact Scale for Rheumatoid Arthritis (FIS-RA) using Rasch analysis. The FIS-RA was translated from English to German, Hungarian, and Dutch target languages and administered to 653 rheumatoid arthritis patients. Rasch analysis was undertaken on the impairment/footwear (FIS-RA(IF) ) and activity limitation/participation restriction subscales for each language version separately and for pooled data. Overall fit to the Rasch model, item and person fit, unidimensionality, differential item function (DIF), and local response dependency were tested. To meet Rasch model assumptions, item deletion, subtests analysis, and item-splitting strategies were adopted. With the exception of the Hungarian FIS-RA(IF) subscale, preliminary fit to the Rasch model was unsuccessful for all target languages individually and for pooled data. Multidimensionality, misfitting items, local dependency, and DIF by age, sex, disease duration, and language were observed. With adjustment, fit to the Rasch model was satisfactorily achieved for all language versions. For the pooled data, the Rasch model assumptions for crosscultural validity were met following item deletion, subtest analysis, and item splitting for ...Continue Reading

Citations

Oct 23, 2020·Arthritis Care & Research·Glen A WhittakerHylton B Menz

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