Abstract
IntroductionFatigue is a frequent symptom in patients with rheumatoid arthritis (RA). The Functional Assessment of Chronic illnesses Therapy-Fatigue (FACIT-F) is an instrument that assesses self-reported fatigue and was validated for measuring fatigue in RA. ObjectiveThe aim of this study was to validate the FACIT-F for use in Spanish-speaking RA patients. Materials and methodsCross-sectional, multicentre study. We included patients (n = 192) with RA diagnosis from two hospitals. Exploratory and confirmatory analyses were conducted. Construct validity and internal consistency were evaluated. ResultsFACIT-F showed high internal consistency (alpha = .87, omega = .93). Analysis of the main components showed a single factor, which explained 62% of the variance. The confirmatory factor analysis showed a satisfactory fit of the model. We found a correlation between FACIT–F, VAS fatigue (-.72 P < .001), and BRAF-MDQ (-.81 P < .001). ConclusionFACIT-F is a valid instrument with a high internal consistency for measuring fatigue in clinical practice and research in Spanish-speaking patients with RA.
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