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Validation of the Fatigue Severity Scale in general population of Mexico City
Reliable and valid ways to measure fatigue are required in order to determine its prevalence and consequences. One of the methods widely used to measure fatigue is the Fatigue Severity Scale (FSS; Krupp, LaRocca, Muir-Nash, & Steinberg, 1989). Thus, the purpose of this study was to validate...
Reliable and valid ways to measure fatigue are required in order to determine its prevalence and consequences. One of the methods widely used to measure fatigue is the Fatigue Severity Scale (FSS; Krupp, LaRocca, Muir-Nash, & Steinberg, 1989). Thus, the purpose of this study was to validate this scale psychometrically in a culturally relevant manner, to identify whether its structure is the most appropriate through a confirmatory factor analysis, and to test the invariance by sex. Two groups of participants, inhabitants of Mexico City, were included in the present study, 150 for validation studies, and 220 for confirmatory factor analysis and invariance test studies. A structure with six items, ade-quate reliability (α = .93), goodness of fit [χ2(9) = 12.56, p = .183; CF1 = .99; RMSEA = .05] and invariance by sex was found. So, it is concluded that FSS is a reliable and valid measure of fatigue.
