Table 4

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

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

Wagner et al. Population Health Metrics 2005 3:8   doi:10.1186/1478-7954-3-8