2014
DOI: 10.1136/bmjopen-2013-003973
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Case definitions for chronic fatigue syndrome/myalgic encephalomyelitis (CFS/ME): a systematic review

Abstract: ObjectiveTo identify case definitions for chronic fatigue syndrome/myalgic encephalomyelitis (CFS/ME), and explore how the validity of case definitions can be evaluated in the absence of a reference standard.DesignSystematic review.SettingInternational.ParticipantsA literature search, updated as of November 2013, led to the identification of 20 case definitions and inclusion of 38 validation studies.Primary and secondary outcome measureValidation studies were assessed for risk of bias and categorised according… Show more

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Cited by 219 publications
(197 citation statements)
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“…10 This case definition requires a patient to meet the following criteria that include the presence of:…”
Section: The 1994 Cdc Case Definitionmentioning
confidence: 99%
“…10 This case definition requires a patient to meet the following criteria that include the presence of:…”
Section: The 1994 Cdc Case Definitionmentioning
confidence: 99%
“…Fatigue persisting for less than six months, or fatigue attributable to an identified organic cause such as hypothyroidism, preclude the diagnosis of CFS [2]. Based on clinical assessment, the worldwide prevalence of CFS is 0.76% [3].…”
Section: Introductionmentioning
confidence: 99%
“…• Prevalence: Estimates of prevalence in adults vary widely, there are few good estimates of prevalence in children, and there are no well-characterized descriptions and estimates of the different levels of severity or of prevalence estimates broken down by disease severity [48]. A conservative estimate of prevalence, based on the most widely accepted study, has been used to best reflect what is known about the disease but this estimate could be either high or low.…”
Section: Limitationsmentioning
confidence: 99%