Samantha Rodríguez-Muguruza , Sonia Castro , María José Poveda , Silvia Paredes , Delia Taverner , Oliver Valero , Ramon Fontova
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Abstract
Introduction
Fatigue 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.
Objective
The aim of this study was to validate the FACIT-F for use in Spanish-speaking RA patients.
Materials and methods
Cross-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.
Results
FACIT-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-value <,001), and BRAF-MDQ (−.81 p-value <.001).
Conclusion
FACIT-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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