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Table 3 Descriptive data, disability, and fatigue scores (as medians) for each class defined in the five-class solution

From: Replication of an empirical approach to delineate the heterogeneity of chronic unexplained fatigue

Descriptive Data Class-1 Class-2 Class-3 Class-4 Class-5
Number in class 97 92 77 76 44
Age (years) 42 44 48 51 38
CFS illness duration (years) 4.3 2.8 5.1 N/A N/A
Disability (SF-36)      
Physical Functioning 80 70 85 93 100
Mental Health 60 60 84 88 92
Social Functioning 75 56 100 100 100
Fatigue (MFI)      
General Fatigue 16 16 12 8 7
Physical Fatigue 12 14 11 7 6
Mental Fatigue 13 13 8 7 5
Reduced Activity 9 11 7 6 6
Reduced Motivation 11 12 8 6 6
  1. SF-36 = Short-Form Health Survey
  2. MFI = Multidimensional Fatigue Inventory