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Table 4 Pearson's correlation matrix of CDC Symptom Inventory scores and MFI, Chalder Fatigue Scale, and SF-36 subscales (N = 164)

From: Psychometric properties of the CDC Symptom Inventory for assessment of Chronic Fatigue Syndrome

  Total score Short-form Case definition score
Questionnaires r P r P r P
MFI       
   General fatigue .64 < .001 .67 < .001 .63 < .001
   Physical fatigue .60 < .001 .62 < .001 .62 < .001
   Reduced activity .60 < .001 .62 < .001 .57 < .001
   Reduced motivation .53 < .001 .53 < .001 .50 < .001
   Mental fatigue .54 < .001 .56 < .001 .54 < .001
Chalder Fatigue Scale .74 < .001 .76 < .001 .75 < .001
SF-36       
   Physical functioning -.58 < .001 -.56 < .001 -.60 < .001
   Role-physical -.64 < .001 -.56 < .001 -.62 < .001
   Bodily pain -.67 < .001 -.56 < .001 -.68 < .001
   General health -.59 < .001 -.59 < .001 -.60 < .001
   Vitality -.68 < .001 -.69 < .001 -.67 < .001
   Social functioning -.66 < .001 -.62 < .001 -.63 < .001
   Role-emotional -.39 < .001 -.40 < .001 -.37 < .001
   Mental health -.46 < .001 -.48 < .001 -. 41 < .001
CDC Symptom Inventory Scores       
   Total    .94 < .001 .97 < .001
Short-form .94 < .001    .95 < .001