Rasch analysis of the Fatigue Severity Scale in Italian subjects with multiple sclerosis.
DOI:
https://doi.org/10.2340/16501977-2116Keywords:
fatigue, psychometrics, questionnaires, outcome assessment, validation studies.Abstract
OBJECTIVE: To perform a psychometric analysis of the Fatigue Severity Scale (FSS) using Rasch analysis in a sample of Italian subjects with multiple sclerosis. METHODS: The 9-item FSS was administered to 156 Italian-speaking subjects with multiple sclerosis. Responses were assessed using Cronbach's alpha, item-remainder correlations, factor analysis and Rasch analysis. RESULTS: The FSS showed good internal consistency (Cronbach's alpha = 0.95), but presented problems in the rating categories and failed to fit the Rasch model. After re-coding and deletion of item 1 (infit mean-square (MnSq) = 1.65Downloads
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