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Table 4 Current classification and illness severity by cluster analysis of 164 study participants with no medical or psychiatric exclusions.

From: Chronic Fatigue Syndrome – A clinically empirical approach to its definition and study

Cluster Group
Current Classification Surveillance Criteria 1 Most Severe 2 Intermediate 3 Least Severe  
CFS 7 (43.8)* 9 (56.3) 0 16
ISF 16 (21.1) 55 (72.4) 5 (6.6) 76
Remission 1 (4.2) 13 (54.2) 10 (41.7) 24
Control 0 5 (10.4) 43 (89.6) 48
  24 82 58 164
  1. * percent of row
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