American researchers compared patients meeting the 1994 CFS definition with those meeting the ME/CFS Canadian definition and the Ramsay ME definition. They found that the ME/CFS 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. Both the ME/CFS and ME criteria appear to select a more severe subset of patients than the 1994 CFS case definition.
Rhif Elusen Gofrestredig 1144534
