Comparison of Euroqol EQ-5D and SF-36 in patients with chronic fatigue syndrome.
Myers, C, Wilks, D · Quality of life research : an international journal of quality of life aspects of treatment, care and rehabilitation · 1999 · DOI
Quick Summary
This study compared two common questionnaires that measure quality of life and health status in people with ME/CFS. Researchers gave both questionnaires to 85 patients and found that the results from the two tests were very similar to each other. The study found that people with ME/CFS reported high levels of physical disability and moderate emotional or psychological problems.
Why It Matters
Selecting appropriate outcome measures is critical for CFS research and clinical care. This study helped establish that the EQ-5D is a valid, efficient tool for assessing health status in ME/CFS patients, though it highlighted the need for disease-specific modifications to better capture the nuanced disability patterns in this population.
Observed Findings
EQ-5D health values and VAS scores correlated strongly and significantly with most SF-36 dimensions (excluding physical role limitation)
Patients reported high levels of physical disability on both questionnaires
Patients reported moderate degrees of emotional and psychological ill-health
EQ-5D items on mobility and self-care referred to inappropriately severe degrees of disability for this CFS population
Certain SF-36 dimensions were oversensitive and failed to discriminate between patients with moderate versus severe disability
Inferred Conclusions
The EQ-5D and SF-36 measure similar constructs in CFS patients and provide complementary information about health status
The EQ-5D would be useful as a rapid assessment tool for health status in CFS
Both instruments require disease-specific modifications to improve their sensitivity and appropriateness for CFS populations
The current calibration of these generic instruments does not optimally reflect the disability patterns characteristic of CFS
Remaining Questions
How do these questionnaires perform longitudinally in tracking changes in health status or disease progression in CFS?
What This Study Does Not Prove
This study does not establish which questionnaire is superior for measuring CFS outcomes, nor does it prove that either instrument is ideal without modification. The cross-sectional design prevents any conclusions about how these measures track changes over time or predict clinical outcomes. The study also cannot determine whether the identified insensitivity of certain items reflects true gaps in disability or represents limitations in questionnaire design for CFS.
Tags
Symptom:Cognitive DysfunctionPainFatigue
Method Flag:Weak Case DefinitionNo ControlsSmall Sample
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 →