Bhatia, Shaun, Olczyk, Nicole, Jason, Leonard A et al. · American journal of social sciences and humanities · 2020 · DOI
This study compared ME/CFS patients in the United States and Spain to see if the disease affects people differently depending on where they live. Researchers found that Spanish patients reported worse overall health and more severe symptoms, particularly pain and hormone-related problems, compared to American patients. The differences may be due to how each country handles disability benefits, how doctors view ME/CFS, and how easily patients can see specialists.
Understanding how ME/CFS manifests across different healthcare systems and cultures can help researchers identify whether observed differences are disease-related or influenced by social and medical factors. This knowledge may improve international clinical standards and highlight the importance of culturally-sensitive healthcare approaches for ME/CFS patients worldwide.
This study cannot determine whether differences between countries are caused by actual biological disease variation, healthcare system factors, or patient reporting differences. The cross-sectional design shows correlation only, not causation. Additionally, the study was limited to tertiary care settings, so findings may not represent the broader ME/CFS patient populations in either country.
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
Bhatia, Shaun, Olczyk, Nicole, Jason, Leonard A, Alegre, Jose, Fuentes-Llanos, Judith, & Castro-Marrero, Jesus (2020). A Cross-National Comparison of Myalgic Encephalomyelitis and Chronic Fatigue Syndrome at Tertiary Care Settings from the US and Spain.. American journal of social sciences and humanities. https://doi.org/10.20448/801.51.104.115
BibTeX
@article{mecfsatlas-bhatia-2020-cross-national,
author = {Bhatia, Shaun and Olczyk, Nicole and Jason, Leonard A and Alegre, Jose and Fuentes-Llanos, Judith and Castro-Marrero, Jesus},
title = {A Cross-National Comparison of Myalgic Encephalomyelitis and Chronic Fatigue Syndrome at Tertiary Care Settings from the US and Spain.},
journal = {American journal of social sciences and humanities},
year = {2020},
doi = {10.20448/801.51.104.115},
note = {PubMed: 34109300},
url = {https://www.mecfsatlas.com/evidence/bhatia-2020-cross-national},
}Atlas snapshot reference
ME/CFS Atlas. Generator v1 / Scanner v1.4 / policy v0.1. Accessed 2026-05-28. https://www.mecfsatlas.com/evidence/bhatia-2020-cross-national
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