Kim, Do-Young, Lee, Jin-Seok, Son, Chang-Gue · Journal of clinical medicine · 2020 · DOI
This study examined how researchers measure treatment effects in ME/CFS clinical trials by reviewing 52 studies published between 1996 and 2020. The researchers found that most trials rely on patient questionnaires asking about fatigue, physical function, and quality of life rather than objective blood tests or physical measurements. Three questionnaires—the SF-36, Checklist Individual Strength, and Chalder Fatigue Questionnaire—were used most often to track whether treatments worked.
Understanding which measurement tools researchers use in clinical trials is crucial because it affects whether treatments are correctly identified as effective or ineffective for ME/CFS. This review helps identify gaps in outcome standardization and demonstrates that the field heavily depends on patient self-report rather than objective biomarkers, which has implications for trial design, regulatory approval, and treatment validation going forward.
This review does not prove which outcome measures are most valid, reliable, or clinically meaningful for ME/CFS—it only documents which ones were used. It does not establish which assessment tools best capture real patient improvement or whether current measurements adequately reflect the complexity of ME/CFS pathophysiology. The study also does not determine whether the shift toward CIS and MFI in recent years represents better science or simply changing research trends.
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 →
The first block is for the primary paper and is the citation you should use in research work. The atlas-snapshot line only applies if you are specifically referring to this atlas’s reading of the paper on the date shown.
Primary citation
Kim, Do-Young, Lee, Jin-Seok, & Son, Chang-Gue (2020). Systematic Review of Primary Outcome Measurements for Chronic Fatigue Syndrome/Myalgic Encephalomyelitis (CFS/ME) in Randomized Controlled Trials.. Journal of clinical medicine. https://doi.org/10.3390/jcm9113463
BibTeX
@article{mecfsatlas-kim-2020-systematic-review,
author = {Kim, Do-Young and Lee, Jin-Seok and Son, Chang-Gue},
title = {Systematic Review of Primary Outcome Measurements for Chronic Fatigue Syndrome/Myalgic Encephalomyelitis (CFS/ME) in Randomized Controlled Trials.},
journal = {Journal of clinical medicine},
year = {2020},
doi = {10.3390/jcm9113463},
note = {PubMed: 33126460},
url = {https://www.mecfsatlas.com/evidence/kim-2020-systematic-review},
}Atlas snapshot reference
ME/CFS Atlas. Generator v1 / Scanner v1.4 / policy v0.1. Accessed 2026-05-29. https://www.mecfsatlas.com/evidence/kim-2020-systematic-review
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