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Chalder fatigue scale
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=== Internal consistency and convergent validity === The Chalder fatigue scale has been shown to have good internal consistency, as indicated by a split half reliabilities of 0.85<ref name=":0" /> and a Cronbach alpha that ranges between 0.86 and 0.92. {| class="wikitable" ! colspan="2" |Cronbach alpha for the 11-item fatigue scale |- |Chalder et al. 1993<ref name=":0" /> |0.88-0.90 |- |Loge et al. 1998<ref name=":3" /> |0.86 |- |Cella et al. 2010<ref name=":1" /> |0.88-0.92 |- |Wong & Fielding 2010<ref name=":7">{{Cite journal | last = Wong | first = Wing S. | last2 = Fielding | first2 = Richard | date = Jan 2010 | title = Construct validity of the Chinese version of the Chalder Fatigue Scale in a Chinese community sample | url =https://www.ncbi.nlm.nih.gov/pubmed/20004305 | journal = Journal of Psychosomatic Research | volume = 68 | issue = 1 | pages = 89β93|doi=10.1016/j.jpsychores.2009.05.008|issn=1879-1360|pmid=20004305}}</ref> |0,86 |} [[De Vries]] et al. 2003 demonstrated that the CFQ had good test-retest reliability and convergent validity, as it correlated strongly with other fatigue questionnaires.<ref name=":4" /> This was confirmed by [[Leonard Jason|Jason]] et al. who noted a good correlation between the CFQ and the fatigue severity scale by Krupp et al.<ref name=":8">{{Cite journal | last = Jason | first = Leonard A. | last2 = Evans | first2 = Meredyth | last3 = Brown | first3 = Molly | last4 = Porter | first4 = Nicole | last5 = Brown | first5 = Abigail | last6 = Hunnell | first6 = Jessica | last7 = Anderson | first7 = Valerie | last8 = Lerch | first8 = Athena | date = 2011 | title = Fatigue Scales and Chronic Fatigue Syndrome: Issues of Sensitivity and Specificity | url= https://www.ncbi.nlm.nih.gov/pubmed/21966179 | journal = Disability Studies Quarterly | volume = 31 | issue = 1|issn=2159-8371|pmc=3181109|pmid=21966179}}</ref>Β The correlation of the CFQ with other measures of health has been conflicting. [[Fong]] et al.<ref name=":6" /> noted that the CFQ correlated modestly with a poor physical and mental quality of life, while [[Wong]] & [[Fielding]] found that the CFQ was weakly correlated with physical quality of life.<ref name=":7" /> According to Jason et al. the CFQ correlated poorly with characteristic CFS-symptoms such as [[post-exertional malaise]] (PEM) or [[Myalgia|muscle pain]], compared to another fatigue questionnaire.<ref name=":8" />
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