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 | ||