Jason, Leonard, Brown, Molly, Evans, Meredyth et al. · Disability and rehabilitation · 2011 · DOI
ME/CFS diagnosis requires showing that a person can do much less in work, school, social activities, or personal care than they could before becoming ill. However, doctors have struggled with how to measure this decline accurately. This study tested which questions from a standard health survey best identify real, substantial losses in functioning in ME/CFS patients, finding that questions about energy levels, physical activities, and social participation worked best.
Standardizing how we measure functional impairment in ME/CFS is essential for consistent diagnosis and case identification in research and clinical practice. Better measurement tools reduce the risk of misdiagnosis and ensure that patients with true substantial functional decline are identified, improving both research validity and clinical care.
This study does not establish causation or explain why certain SF-36 subscales are more sensitive than others. It also cannot determine whether these cutoff scores are universally optimal across different populations (age, severity, disease stage) or whether the SF-36 alone is sufficient without other functional assessments. The cross-sectional design means it captures functioning at one point in time, not changes in functioning over the course of illness.
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, Brown, Molly, Evans, Meredyth, Anderson, Valerie, Lerch, Athena, Brown, Abigail, et al. (2011). Measuring substantial reductions in functioning in patients with chronic fatigue syndrome.. Disability and rehabilitation. https://doi.org/10.3109/09638288.2010.503256
BibTeX
@article{mecfsatlas-jason-2011-measuring-substantial,
author = {Jason, Leonard and Brown, Molly and Evans, Meredyth and Anderson, Valerie and Lerch, Athena and Brown, Abigail and Hunnell, Jessica and Porter, Nicole},
title = {Measuring substantial reductions in functioning in patients with chronic fatigue syndrome.},
journal = {Disability and rehabilitation},
year = {2011},
doi = {10.3109/09638288.2010.503256},
note = {PubMed: 20617920},
url = {https://www.mecfsatlas.com/evidence/jason-2011-measuring-substantial},
}Atlas snapshot reference
ME/CFS Atlas. Generator v1 / Scanner v1.4 / policy v0.1. Accessed 2026-05-26. https://www.mecfsatlas.com/evidence/jason-2011-measuring-substantial
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