E2 ModeratePreliminaryPEM not requiredCross-SectionalPeer-reviewedReviewed
Validation of the qi blood yin yang deficiency questionnaire on chronic fatigue.
Kim, Jihye, Ku, Boncho, Kim, Keun Ho · Chinese medicine · 2016 · DOI
Quick Summary
This study tested a questionnaire designed to identify different patterns of chronic fatigue based on Traditional Korean Medicine concepts (qi, blood, yin, and yang imbalances). Researchers gave the questionnaire to 129 people with chronic fatigue and found that it reliably distinguished between different types of fatigue patterns. The questionnaire may help doctors better understand what kind of fatigue a patient has.
Why It Matters
Improved diagnostic and classification methods for chronic fatigue are urgently needed, as ME/CFS currently lacks reliable biomarkers. This study provides evidence that pattern-based questionnaires may help stratify patients into clinically meaningful subgroups, which could improve treatment matching and research precision.
Observed Findings
- QBYY-Q demonstrated satisfactory internal consistency across all four deficiency pattern subscales.
- Explanatory factor analysis extracted two factors for each deficiency pattern, explaining 45-63% of variance.
- Each QBYY-Q deficiency score was positively associated with its corresponding deficiency pattern.
- Odds ratios for blood, yin, and yang deficiency were 10.97, 10.69, and 14.64 respectively (compared to qi deficiency).
- 70 participants were classified with chronic fatigue syndrome and 59 with idiopathic chronic fatigue.
Inferred Conclusions
- The QBYY-Q is a reliable tool for identifying qi, blood, yin, and yang deficiency patterns in chronic fatigue patients.
- The questionnaire discriminates adequately between different deficiency patterns based on symptom profiles.
- Pattern-based classification may be a valid approach for subtyping chronic fatigue in Traditional Korean Medicine framework.
Remaining Questions
- Do QBYY-Q-identified deficiency patterns predict treatment response to specific interventions?
- How do QBYY deficiency patterns correlate with objective biomarkers (immune markers, metabolic abnormalities, post-exertional malaise)?
What This Study Does Not Prove
This study does not prove that Traditional Korean Medicine deficiency patterns are biological mechanisms of ME/CFS. It is cross-sectional and cannot establish causation or predict treatment response. The questionnaire's validity depends on the accuracy of the underlying pattern identification framework, which has not been independently validated against objective biomarkers.
Tags
Symptom:Fatigue
Method Flag:PEM Not DefinedNo ControlsSmall SampleExploratory OnlyMixed Cohort
Metadata
- DOI
- 10.1186/s13020-016-0092-y
- PMID
- 27141228
- Review status
- Editor reviewed
- Evidence level
- Single-study or moderate support from human research
- Last updated
- 12 April 2026
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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