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Table 3 Distribution of ME/CFS cases (prevalent and incident) according to the study case definitions

From: Prevalence of myalgic encephalomyelitis/chronic fatigue syndrome (ME/CFS) in three regions of England: a repeated cross-sectional study in primary care

ME/CFS Diagnostic Criteria   n %
Any ME/CFS diagnostic criteria   278 100.0
CDC - 1994   270 97.1
CDC - 1994 onlya   103 37.1
Canadian   146 52.5
Canadian onlya   1 0.4
ECD   47 16.9
ECD onlya   7 2.5
Overlap of case definitions CDC - 1994 and Canadian 127 45.7
  CDC - 1994, Canadian and ECD 18 6.5
  CDC - 1994 and ECD 22 7.9
  1. aNon compliant with other definitions