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Table 4 Independence of all five classes and the three classes defining ill/fatigued subjects

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

  All Classes   3 Ill Classes  
Disability (SF-36) χ 2 P χ 2 P
Physical functioning 129.2 0.000 26.8 0.000
Mental health 133.5 0.000 48.0 0.000
Social functioning 159.1 0.000 57.1 0.000
Fatigue (MFI)     
General fatigue 177.8 0.000 47.1 0.000
Physical fatigue 149.2 0.000 22.7 0.000
Mental fatigue 164.4 0.000 64.5 0.000
Activity reduction 80.1 0.000 17.6 0.000
Motivation reduction 117.4 0.000 30.2 0.000
  1. SF-36 = Short-Form Health Survey
  2. MFI = Multidimensional Fatigue Inventory