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Table 6 Convergent Validity: Pearson Correlation Coefficients between the MFI-20, SF-36, SDS, and STAI in overall sample.

From: Further validation of the Multidimensional Fatigue Inventory in a US adult population 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
  1. All p-values for pairwise Pearson correlations are less than 0.0001.
  2. Absolute correlation coefficients of 0.5 to 1.0 [35] are considered high correlations, in bold.
  3. 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)
  4. PCS: Physical Component Summary; MCS: Mental Component Summary