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Chalder fatigue scale
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=== Physical and mental fatigue === The 11-item chalder fatigue scale is often divided into two components: one that measures physical fatigue (questions 1-7) and one that measures mental fatigue (questions 8-11).<ref name=":0" /> These components were confirmed by an analysis of a sample of 361 ME/CFS patients and 1615 healthy persons.<ref name=":1" />Β Other analyses however found only 1<ref name=":4" /><ref name=":9">{{Cite journal | last = Chalder | first = Trudie | last2 = Ali | first2 = Sheila | last3 = Matcham | first3 = Faith | last4 = Norton | first4 = Sam | date = 2016-04-01 | title = 126 Psychometric Properties of Two Fatigue Scales in Rheumatology Outpatients: Unidimensional Scales Measuring Multifaceted Constructs |url =https://academic.oup.com/rheumatology/article/55/suppl_1/i113/1794176 | journal = Rheumatology|language=en | volume = 55 | issue = suppl_1| pages=i113βi114|doi=10.1093/rheumatology/kew130.010|issn=1462-0324}}</ref><ref name=":10">{{Cite journal | last = Jing | first = Meng-Juan | last2 = Lin | first2 = Wei-Quan | last3 = Wang | first3 = Qiang | last4 = Wang | first4 = Jia-Ji | last5 = Tang | first5 = Jie | last6 = Jiang | first6 = En-She | last7 = Lei | first7 = Yi-Xiong | last8 = Wang | first8 = Pei-Xi | date = Jan 2016 | title = Reliability and Construct Validity of Two Versions of Chalder Fatigue Scale among the General Population in Mainland China | url = https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4730538/ | journal = International Journal of Environmental Research and Public Health | volume = 13 | issue = 1|doi=10.3390/ijerph13010147|issn=1661-7827|pmc=4730538|pmid=26805863}}</ref> or more than two components<ref name=":5">{{Cite journal | last = Morriss | first = R.K. | last2 = Wearden | first2 = A.J. | last3 = Mullis | first3 = R. | date = Nov 1998 | title = Exploring the validity of the Chalder Fatigue scale in chronic fatigue syndrome | url =https://www.ncbi.nlm.nih.gov/pubmed/9835234 | journal = Journal of Psychosomatic Research | volume = 45 | issue = 5 | pages = 411β417|issn=0022-3999|pmid=9835234}}</ref><ref name=":6">{{Cite journal | last = Fong | first = Ted C.T. | last2 = Chan | first2 = Jessie S.M. | last3 = Chan | first3 = Cecilia L.W. | last4 = Ho | first4 = Rainbow T.H. | last5 = Ziea | first5 = Eric T.C. | last6 = Wong | first6 = Vivian C.W. | last7 = Ng | first7 = Bacon F.L. | last8 = Ng | first8 = S.M. | date = Sep 2015 | title = Psychometric properties of the Chalder Fatigue Scale revisited: an exploratory structural equation modeling approach | url = https://www.ncbi.nlm.nih.gov/pubmed/25688039 | journal = Quality of Life Research: An International Journal of Quality of Life Aspects of Treatment, Care and Rehabilitation | volume = 24 | issue = 9 | pages = 2273β2278|doi=10.1007/s11136-015-0944-4|issn=1573-2649|pmc=4529874|pmid=25688039}}</ref> in the 11-item Chalder fatigue scale.
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