Ahn, Yo-Chan, Lee, Jin-Seok, Son, Chang-Gue · Healthcare (Basel, Switzerland) · 2020 · DOI
This study tested whether a Korean version of a fatigue measurement tool called the mKCFQ11 accurately measures fatigue in ME/CFS patients. Researchers gave the test to 97 people and compared their scores to other well-known fatigue and quality-of-life tests. The tool performed very well, reliably measuring both physical and mental fatigue.
Since ME/CFS lacks objective biomarkers for diagnosis, validated fatigue measurement tools are essential for both clinical assessment and research. This study demonstrates that the mKCFQ11 is a reliable instrument for Korean-speaking ME/CFS patients and can be used to track treatment response and compare fatigue severity across patients and studies.
This study does not establish whether fatigue improvements measured by mKCFQ11 reflect clinical meaningful changes or recovery, nor does it demonstrate that any particular treatment is effective. The study is a validation methodology paper, not a treatment outcome trial, so it cannot prove what causes fatigue or how to treat ME/CFS.
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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Primary citation
Ahn, Yo-Chan, Lee, Jin-Seok, & Son, Chang-Gue (2020). Reliability and Validity of the Modified Korean Version of the Chalder Fatigue Scale (mKCFQ11).. Healthcare (Basel, Switzerland). https://doi.org/10.3390/healthcare8040427
BibTeX
@article{mecfsatlas-ahn-2020-reliability-validity,
author = {Ahn, Yo-Chan and Lee, Jin-Seok and Son, Chang-Gue},
title = {Reliability and Validity of the Modified Korean Version of the Chalder Fatigue Scale (mKCFQ11).},
journal = {Healthcare (Basel, Switzerland)},
year = {2020},
doi = {10.3390/healthcare8040427},
note = {PubMed: 33114401},
url = {https://www.mecfsatlas.com/evidence/ahn-2020-reliability-validity},
}Atlas snapshot reference
ME/CFS Atlas. Generator v1 / Scanner v1.4 / policy v0.1. Accessed 2026-05-28. https://www.mecfsatlas.com/evidence/ahn-2020-reliability-validity
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