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Chalder fatigue scale
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=== From 14 to 11 items === 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.<ref name=":0" /> While the 14-item scale was used in several studies in the 1990s, the 11-item version is the most used version, today. # Do you have problems with tiredness? # Do you need to rest more? # Do you feel [[Somnolence|sleepy]] or drowsy? # Do you have problems starting things? # Do you lack energy? # Do you have [[Muscle fatigability|less strength in your muscles]]? # Do you feel weak? # Do you have [[Cognitive dysfunction|difficulties concentrating]]? # Do you make [[Speech difficulties|slips of the tongue when speaking]]? # Do you find it more [[Word-finding problems|difficult to find the right word]]? # How is your [[Memory problems|memory]]? The deteled items from the 14-item scale are: * Do you start things without difficulty but get weak as you go on? * Do you think as clearly as usual? * Are you still interested in the things you used to do?
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