Due to these limitations and to the lack of clear definition in the components identified, a replication of the factorial structure of the fatigue scale seems warranted.ĭespite its large use, no study has attempted to cross-validate the psychometric property of the fatigue scale comparing clinical and nonclinical populations. In discussing the results of the PCA, the authors noted that the patients used for the analysis were part of a randomized controlled trial and therefore may not have been representative of CFS patients. Similarly, Components II and III had higher loadings for Item 9. As a result, Component IV included only two items, one of which (Item 6) had a higher loading on Component I. In this study, the authors retained all the components with eigenvalues higher than 1, according to Kaiser's retention rule. Factors found were cognitive difficulties (I), tiredness and sleepiness (II), strength and endurance (III), and loss of interest and motivation (IV). examined the reliability of the scale in CFS patients finding that four factors denoted fatigue. The scale has also been used in measuring fatigue in various conditions including cancer, postpolio syndrome, and multiple sclerosis. Since its introduction, the Chalder Fatigue Scale (CFQ) has been used in a variety of settings including randomized controlled trials, general population, primary and secondary care. Principal component analysis resulted in two components, namely, physical and mental fatigue. Following a principal component analysis (PCA) and item discriminative properties based on receiver-operating characteristic (ROC) analysis, the authors excluded three items proposing a final scale of 11 items. In this study, the newly developed scale was administered to new registrations at a general practice. developed a 14-item scale to measure fatigue. Reliable quantification and detection of abnormal levels of fatigue in both general and clinical populations are therefore important to formulate early intervention plans and to assess effectiveness of treatments. It is estimated that only 5% (i.e., median full recovery rate) of the CFS patients will naturally recover a number of treatments including cognitive behavioral therapy and graded exercise therapy have shown to be effective in reducing fatigue. CFS is associated with significant disability in personal and professional settings. The prevalence of CFS is estimated between 0.1% and 3% in the general population depending upon the diagnostic criteria used. CFS patients present with persistent and relapsing unexplained fatigue with new and definitive onset lasting for at least 6 months. Fatigue is considered the most severe and debilitating symptom in chronic fatigue syndrome (CFS). Fatigue after exertion is normal although an excessive level of fatigability is often related to a variety of chronic conditions.
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