Table 6.
Convergent Validity: Pearson Correlation Coefficients between the MFI-20, SF-36, SDS, and STAI† in overall sample.
| MFI-20 | ||||||
|---|---|---|---|---|---|---|
| General Fatigue |
Physical Fatigue |
Reduced Activity |
Reduced Motivation |
Mental Fatigue |
Total Score |
|
| SF-36 | ||||||
| Physical Functioning | -0.496 | -0.643 | -0.522 | -0.490 | -0.376 | -0.564 |
| Role Physical | -0.591 | -0.589 | -0.464 | -0.502 | -0.429 | -0.599 |
| Bodily Pain | -0.498 | -0.546 | -0.386 | -0.390 | -0.338 | -0.486 |
| Social Functioning | -0.553 | -0.535 | -0.506 | -0.592 | -0.500 | -0.645 |
| Mental Health | -0.547 | -0.461 | -0.436 | -0.564 | -0.550 | -0.631 |
| Role Emotional | -0.462 | -0.409 | -0.379 | -0.435 | -0.480 | -0.530 |
| Vitality | -0.825 | -0.689 | -0.582 | -0.708 | -0.574 | -0.811 |
| General Health | -0.659 | -0.713 | -0.533 | -0.562 | -0.479 | -0.672 |
| PCS‡ | -0.540 | -0.671 | -0.492 | -0.450 | -0.327 | -0.544 |
| MCS‡ | -0.563 | -0.448 | -0.455 | -0.589 | -0.563 | -0.653 |
| SDS | ||||||
| SDS Index | 0.626 | 0.541 | 0.498 | 0.649 | 0.608 | 0.718 |
| STAI | ||||||
| State-Anxiety Score | 0.413 | 0.352 | 0.336 | 0.457 | 0.469 | 0.503 |
| Trait-Anxiety Score | 0.519 | 0.421 | 0.423 | 0.558 | 0.563 | 0.620 |
All p-values for pairwise Pearson correlations are less than 0.0001.
Absolute correlation coefficients of 0.5 to 1.0 [35] are considered high correlations, in bold.
† Multidimensional Fatigue Inventory (MFI-20), the Medical Outcomes Survey Short Form-36 (SF-36), the Zung Self-Rating Depression Scale (SDS), and the Spielberger State-Trait Anxiety Inventory (STAI)
‡ PCS: Physical Component Summary; MCS: Mental Component Summary