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Table 2 Positive predictive value of primary diagnoses given by GPs for ME/CFS

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

GP's primary diagnoses ME/CFS Not ME/CFS   Positive Predictive Value (%)
  n % n % Total  
Any primary diagnosis 278 100.0 126 100.0 404 68.8
   Chronic fatigue syndrome 175 62.9 67 53.2 242 72.3
   Fibromyalgia syndrome 81 29.1 33 26.2 114 71.1
   Fatigue syndrome 3 1.1 2 1.6 5 60.0
   Post-viral asthenic syndrome 16 5.8 18 14.3 34 47.1
   Other a 3 1.1 6 4.8 9 33.3
  1. aThat is, post-viral debility, post-viral syndrome, post-viral fatigue