Johnston, Samantha, Brenu, Ekua W, Staines, Donald R et al. · Annals of epidemiology · 2013 · DOI
This study looked at 31 different research projects that tried to measure how many people have ME/CFS, and found that scientists were using 8 different sets of diagnostic criteria (rules for identifying the illness). The 1994 CDC criteria became the most commonly used worldwide, but the authors argue that newer, more precise diagnostic standards like the Canadian Consensus Criteria and International Consensus Criteria should be used instead to get more accurate prevalence numbers.
Accurate prevalence estimates are essential for public health planning, research funding allocation, and clinical recognition of ME/CFS. This review demonstrates that older diagnostic criteria may be capturing broader patient populations and obscuring the true burden of disease, making it harder for policymakers and clinicians to understand the actual impact of ME/CFS. Adopting newer, more specific criteria could help ensure that epidemiological data better reflects the severely ill population most in need of research attention and clinical resources.
This systematic review does not establish which case definition is most clinically accurate or which best predicts prognosis and treatment response. It does not measure prevalence itself, only documents which definitions researchers used; therefore it cannot determine whether different prevalence estimates reflect real differences in disease frequency or simply different diagnostic approaches. The study does not compare the reliability or validity of the various criteria against biological biomarkers or clinical outcomes.
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
Johnston, Samantha, Brenu, Ekua W, Staines, Donald R, & Marshall-Gradisnik, Sonya (2013). The adoption of chronic fatigue syndrome/myalgic encephalomyelitis case definitions to assess prevalence: a systematic review.. Annals of epidemiology. https://doi.org/10.1016/j.annepidem.2013.04.003
BibTeX
@article{mecfsatlas-johnston-2013-adoption-chronic,
author = {Johnston, Samantha and Brenu, Ekua W and Staines, Donald R and Marshall-Gradisnik, Sonya},
title = {The adoption of chronic fatigue syndrome/myalgic encephalomyelitis case definitions to assess prevalence: a systematic review.},
journal = {Annals of epidemiology},
year = {2013},
doi = {10.1016/j.annepidem.2013.04.003},
note = {PubMed: 23683713},
url = {https://www.mecfsatlas.com/evidence/johnston-2013-adoption-chronic},
}Atlas snapshot reference
ME/CFS Atlas. Generator v1 / Scanner v1.4 / policy v0.1. Accessed 2026-05-27. https://www.mecfsatlas.com/evidence/johnston-2013-adoption-chronic
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