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Checklist Individual Strength
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=== Convergent validity === Research has shown that the results of the CIS are comparable to those other measure of fatigue, such as fatigue measured on a unidimensional five point Likert scale or the scale exhaustion of the Maslach burnout inventory—general survey (MBI-GS).<ref name=":4">{{Cite journal | last = Beurskens | first = A.J. | last2 = Bültmann | first2 = U. | last3 = Kant | first3 = I. | last4 = Vercoulen | first4 = J.H. | last5 = Bleijenberg | first5 = G. | last6 = Swaen | first6 = G.M. | date = May 2000 | title = Fatigue among working people: validity of a questionnaire measure | url =https://www.ncbi.nlm.nih.gov/pubmed/10769302 | journal = Occupational and Environmental Medicine | volume = 57 | issue = 5 | pages = 353–357|issn=1351-0711|pmc=1739950|pmid=10769302}}</ref> Using a large sample of 351 persons of the working population, De Vries et al. showed that the CIS correlated with other fatigue questionnaires such as the Chalder Fatigue Scale.<ref>{{Cite journal | last = De Vries | first = J | last2 = Michielsen | first2 = H | last3 = Van Heck | first3 = G L | date = Jun 2003 | title = Assessment of fatigue among working people: a comparison of six questionnaires |url =https://www.ncbi.nlm.nih.gov/pmc/articles/PMC1765720/ | journal = Occupational and Environmental Medicine | volume = 60 | issue = Suppl 1 | pages = i10–i15|doi=10.1136/oem.60.suppl_1.i10|issn=1351-0711|pmc=1765720|pmid=12782741}}</ref> In other studies, the concentration subscale of the CIS correlated with the subscale concentration problems of the Sickness Impact Profile (SIP),<ref>{{Cite journal | last = Vercoulen | first = JH | last2 = Swanink | first2 = CM | last3 = Fennis | first3 = JF | last4 = Galama | first4 = JM | last5 = van der Meer | first5 = JW | last6 = Bleijenberg | first6 = G | date = 1996-05-01 | title = Prognosis in chronic fatigue syndrome: a prospective study on the natural course. | url = http://dx.doi.org/10.1136/jnnp.60.5.489 | journal = Journal of Neurology, Neurosurgery & Psychiatry | volume = 60 | issue = 5 | pages = 489–494|doi=10.1136/jnnp.60.5.489|issn=0022-3050}}</ref> while the subscale fatigue severity correlated with activity levels measured by an Actometer.<ref>{{Cite journal | last = Vercoulen | first = J.H.M.M. | last2 = Bazelmans | first2 = E. | last3 = Swanink | first3 = C.M.A. | last4 = Fennis | first4 = J.F.M. | last5 = Galama | first5 = J.M.D. | last6 = Jongen | first6 = P.J.H. | last7 = Hommes | first7 = O. | last8 = Van Der Meer | first8 = J.W.M. | last9 = Bleijenberg | first9 = G. | date = Nov 1997 | title = Physical activity in chronic fatigue syndrome: Assessment and its role in fatigue | url =http://dx.doi.org/10.1016/s0022-3956(97)00039-3 | journal = Journal of Psychiatric Research | volume = 31 | issue = 6 | pages = 661–673|doi=10.1016/s0022-3956(97)00039-3|issn=0022-3956}}</ref>
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