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Table 3 Characteristics of 2-steps 3-cluster analysis solution for 164 subjects with no medical or psychiatric exclusions.

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

Characteristic Cluster 1 Most Severe (n = 30) Cluster 2 Intermediate (n = 67) Cluster 3 Least Severe (n = 67)
   SF-36 Scales (mean ± sd)    
Physical function 49.5 ± 21.8 71.8 ± 20.1 91.0 ± 10.3
Role physical 12.5 ± 26.9 48.1 ± 36.0 92.5 ± 19.5
Bodily pain 39.5 ± 18.3 53.7 ± 16.5 79.4 ± 15.6
General health 45.4 ± 19.3 67.4 ± 13.8 85.3 ± 12.6
Vitality 14.3 ± 11.0 34.6 ± 15.8 69.6 ± 16.0
Social function 45.4 ± 24.0 67.9 ± 18.4 96.3 ± 8.7
Role emotional 47.8 ± 41.7 74.1 ± 35.2 96.0 ± 13.6
Mental health 61.5 ± 19.5 74.4 ± 13.5 86.9 ± 9.1
   MFI Scales (mean ± sd)    
General fatigue 18.4 ± 1.4 15.1 ± 2.7 8.7 ± 3.2
Physical fatigue 15.4 ± 2.7 11.6 ± 2.8 6.7 ± 2.1
Mental fatigue 15.9 ± 3.5 10.3 ± 3.9 6.6 ± 2.7
Reduced motivation 13.4 ± 4.0 10.3 ± 3.0 6.2 ± 2.0
Reduced activity 15.8 ± 3.3 11.9 ± 3.5 5.9 ± 2.0
Symptom Inventory (mean ± sd) 52.2 ± 24.8 21.6 ± 12.6 7.0 ± 8.5
  1. All clusters were significantly different from the other clusters with respect to all scales