Jason, Leonard A, Sunnquist, Madison, Brown, Abigail et al. · Journal of neurology and neurobiology · 2015 · DOI
Researchers analyzed symptom patterns in people with ME/CFS from three countries to better understand what makes this illness unique. Using statistical analysis, they found that ME/CFS symptoms naturally organize into four main groups: exhaustion that gets worse after activity, brain fog and memory problems, sleep issues, and a combination of hormone, nervous system, and immune problems. This organized way of thinking about symptoms could help doctors recognize and study the disease more effectively.
Identifying core symptom domains provides a more systematic framework for understanding ME/CFS pathophysiology and could standardize how researchers measure disease severity and treatment response. For patients, recognizing that their varied symptoms cluster into meaningful categories validates that ME/CFS is not simply general fatigue but a complex condition affecting multiple biological systems simultaneously.
This study does not establish which symptoms cause others or whether these four domains reflect separate underlying biological mechanisms versus different expressions of a single disease process. The factor structure identified applies specifically to the DePaul Symptom Questionnaire and may not capture all ME/CFS experiences; findings are correlational and require confirmatory factor analysis and mechanistic research to validate.
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
Jason, Leonard A, Sunnquist, Madison, Brown, Abigail, Furst, Jacob, Cid, Marjoe, Farietta, Jillianna, et al. (2015). Factor Analysis of the DePaul Symptom Questionnaire: Identifying Core Domains.. Journal of neurology and neurobiology. https://doi.org/10.16966/2379-7150.114
BibTeX
@article{mecfsatlas-jason-2015-factor-analysis,
author = {Jason, Leonard A and Sunnquist, Madison and Brown, Abigail and Furst, Jacob and Cid, Marjoe and Farietta, Jillianna and Kot, Bobby and Bloomer, Craig and Nicholson, Laura and Williams, Yolonda and Jantke, Rachel and Newton, Julia L and Strand, Elin Bolle},
title = {Factor Analysis of the DePaul Symptom Questionnaire: Identifying Core Domains.},
journal = {Journal of neurology and neurobiology},
year = {2015},
doi = {10.16966/2379-7150.114},
note = {PubMed: 27088131},
url = {https://www.mecfsatlas.com/evidence/jason-2015-factor-analysis},
}Atlas snapshot reference
ME/CFS Atlas. Generator v1 / Scanner v1.4 / policy v0.1. Accessed 2026-05-28. https://www.mecfsatlas.com/evidence/jason-2015-factor-analysis
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