Adaptation and cross-cultural validation of the foot impact scale for rheumatoid arthritis (FIS-RA) using Rasch analysis
Arthritis Care & Research , 04/27/2012
Woodburn J et al. – With adaptations, FIS–RA was successfully translated and cross–culturally validated for use in 4 European languages. The two subscales can be used at the individual level for patient assessment and at the group level for research purposes.
The FIS–RA was translated from English to German, Hungarian and Dutch target languages and administered to 653 rheumatoid arthritis (RA) patients.
Rasch analysis was undertaken on the impairment/footwear (FIS–RAIF) and activity/participation (FIS–RAAP) 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–RAIF subscale, preliminary fit to the Rasch model was unsuccessful for all target languages individually and pooled data.
Multidimensionality, misfitting items, local dependency and DIF by age, gender, 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 cross–cultural validity were met following item deletion, subtest analysis and item splitting for language DIF.
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