![]() In the Likert scoring system, respondents can give a score of 0 to 3 to indicate how each statement applies to them, from “less than usual” to “much more than usual”. In the bimodal scoring system, respondents answer each question with a 1 or a 0 to indicate the questions apply to them or not. The Chalder fatigue has two scoring system. Are you still interested in the things you used to do?.Do you start things without difficulty but get weak as you go on?.The deteled items from the 14-item scale are: Do you find it more difficult to find the right word?.Do you make slips of the tongue when speaking?.Do you have difficulties concentrating?.Do you have less strength in your muscles?.While the 14-item scale was used in several studies in the 1990s, the 11-item version is the most used version, today. Three versions of the CFQ exist. Originally the scale had 14 questions but following a principal component analysis (PCA) and item discriminative properties based on receiver-operating characteristic (ROC) analysis, 3 items were excluded. The scale was based on a similar questionnaire that had been used in a hospital-based case study comparing ME/CFS patients to patients with neuromuscular and affective illnesses, and a study testing the efficacy of cognitive behavioral therapy ( CBT) in ME/CFS patients. The Chalder fatigue scale was developed by the research team of Trudie Chalder at King's College London in 1993. ![]() 2.1 Internal consistency and convergent validityīackground Origin.
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