title: Contrasting case definitions for chronic fatigue syndrome, Myalgic Encephalomyelitis/chronic fatigue syndrome and myalgic encephalomyelitis.
abstract: This article uses data from patients recruited using the 1994 case definition of chronic fatigue syndrome (CFS) to contrast those meeting criteria for the Myalgic Encephalomyelitis/chronic fatigue syndrome (ME/CFS) Canadian case definition with those that did not meet these criteria. The study also contrasts those meeting criteria for Myalgic Encephalomyelitis (ME) based on criteria from Ramsay and other theorists with those that did not meet the ME criteria. The ME/CFS case definition criteria identified a subset of patients with more functional impairments and physical, mental, and cognitive problems than the subset not meeting these criteria. The ME subset had more functional impairments, and more severe physical and cognitive symptoms than the subset not meeting ME criteria. When applied to a population meeting the 1994 CFS case definition, both ME/CFS and ME criteria appear to select a more severe subset of patients.
authors.affiliation: DePaul University, Chicago, IL 60614, USA.
authors.forename: Leonard A
authors.initials: LA
authors.lastname: Jason
authors.forename: Abigail
authors.initials: A
authors.lastname: Brown
authors.forename: Erin
authors.initials: E
authors.lastname: Clyne
authors.forename: Lindsey
authors.initials: L
authors.lastname: Bartgis
authors.forename: Meredyth
authors.initials: M
authors.lastname: Evans
authors.forename: Molly
authors.initials: M
authors.lastname: Brown
mesh_terms: D000223:Adaptation, Psychological; D000328:Adult; D000704:Analysis of Variance; D003071:Cognition; D015673:Fatigue Syndrome, Chronic / Q000145:classification / Q000175:diagnosis* / Q000523:psychology; D005260:Female; D006305:Health Status Indicators; D006801:Humans; D008297:Male; D008603:Mental Health; D011594:Psychometrics; D012720:Severity of Illness Index; D013315:Stress, Psychological; D011795:Surveys and Questionnaires