E2 ModerateModerate confidencePEM unclearCross-SectionalPeer-reviewedMachine draft
Comparison of assessment scores for fatigue between multidimensional fatigue inventory (MFI-K) and modified chalder fatigue scale (mKCFQ).
Lim, Eun-Jin, Son, Chang-Gue · Journal of translational medicine · 2022 · DOI
Quick Summary
This study compared two questionnaires used to measure fatigue: the Multidimensional Fatigue Inventory (MFI-K) and the modified Chalder Fatigue Scale (mKCFQ). Researchers asked 70 people with varying levels of fatigue to complete both questionnaires and then analyzed how similarly the two tools measured fatigue. Both questionnaires showed strong agreement overall, but they measured different aspects of fatigue with varying accuracy.
Why It Matters
Since ME/CFS lacks biological diagnostic markers, accurate fatigue measurement tools are essential for diagnosis and monitoring. This comparison helps clinicians and researchers understand which questionnaire is most appropriate for different patient populations and fatigue severity levels, potentially improving diagnostic accuracy and clinical trial design in ME/CFS research.
Observed Findings
- Total fatigue scores showed strong correlation between instruments (r=0.75), with physical fatigue dimensions correlating more highly than emotional/behavioral dimensions.
- MFI-K scores were consistently higher than mKCFQ scores (45.8±11.3 vs 36.1±16.2), with greater overestimation in the mild fatigue group.
- The mKCFQ more effectively distinguished between the three fatigue severity groups compared to MFI-K.
- General and physical fatigue dimensions showed high agreement (r=0.79 and r=0.66 respectively), while motivation (r=0.41) and activity (r=0.26) dimensions showed weaker correlation.
Inferred Conclusions
- Both instruments reliably measure physical fatigue dimensions but diverge in assessing motivational and activity-related fatigue.
- MFI-K may be better suited for identifying moderate-to-severe fatigue conditions such as ME/CFS, while mKCFQ provides more sensitive detection across the full fatigue spectrum.
- The choice of fatigue assessment tool should be guided by the clinical context and whether broad or specific fatigue domains are the priority.
Remaining Questions
- How do these instruments perform longitudinally in ME/CFS patients? Do they adequately capture post-exertional malaise, a hallmark ME/CFS symptom?
- Which instrument better predicts functional outcomes or treatment response in ME/CFS?
What This Study Does Not Prove
This study does not establish which instrument is superior in absolute terms, nor does it validate either tool against biological markers of fatigue or ME/CFS-specific outcomes. The cross-sectional design cannot determine causality or longitudinal stability of these measurements. Additionally, the self-reported fatigue grouping itself was not independently validated.
Tags
Symptom:Fatigue
Method Flag:Weak Case DefinitionNo ControlsSmall SampleExploratory Only
About the PEM badge: “PEM required” means post-exertional malaise was an explicit required diagnostic criterion for participant inclusion in this study — not that PEM was studied, observed, or discussed. Studies using criteria that do not require PEM (e.g. Fukuda, Oxford) are tagged “PEM not required”. How the atlas works →
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