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Table 3 Comparison of CFS Case Ascertainment using Two Methods of Applying the 1994 Case Definition (n=499)

From: Methods of applying the 1994 case definition of chronic fatigue syndrome – impact on classification and observed illness characteristics

   Method 1
   CFS Non-CFS
Method 2 CFS 44 27
Non-CFS 15 413
  Kappa= 0.63, 95 % CI= 0.53 - 0.73.
Concordance= 91.59 %
Discordance= 8.41 %