Zachrisson, Olof, Regland, Björn, Jahreskog, Marianne et al. · Journal of psychosomatic research · 2002 · DOI
Researchers created a simple checklist called the FibroFatigue scale to help doctors measure how severe fibromyalgia and ME/CFS symptoms are and track whether treatments are working. The scale includes 12 questions about common symptoms like pain, tiredness, sleep problems, and concentration difficulties. The new tool was tested on 100 women with both conditions and was found to be reliable and accurate.
Having a standardized, validated rating scale helps researchers consistently measure treatment effects in ME/CFS and fibromyalgia trials, which improves the quality of evidence for new therapies. For patients, reliable outcome measures mean that clinical research can better detect whether treatments actually work, leading to more rigorous evaluation of potential treatments and faster identification of effective interventions.
This study does not prove that any particular treatment is effective—it only validates a measurement tool. The study was conducted exclusively in women with concurrent FM and CFS, so the scale's reliability in men, in patients with ME/CFS alone, or in other populations remains unestablished. The scale measures symptom severity but does not identify causes of ME/CFS or explain the underlying biology.
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
Zachrisson, Olof, Regland, Björn, Jahreskog, Marianne, Kron, Margareta, & Gottfries, Carl G (2002). A rating scale for fibromyalgia and chronic fatigue syndrome (the FibroFatigue scale).. Journal of psychosomatic research. https://doi.org/10.1016/s0022-3999(01)00315-4
BibTeX
@article{mecfsatlas-zachrisson-2002-rating-scale,
author = {Zachrisson, Olof and Regland, Björn and Jahreskog, Marianne and Kron, Margareta and Gottfries, Carl G},
title = {A rating scale for fibromyalgia and chronic fatigue syndrome (the FibroFatigue scale).},
journal = {Journal of psychosomatic research},
year = {2002},
doi = {10.1016/s0022-3999(01)00315-4},
note = {PubMed: 12069875},
url = {https://www.mecfsatlas.com/evidence/zachrisson-2002-rating-scale},
}Atlas snapshot reference
ME/CFS Atlas. Generator v1 / Scanner v1.4 / policy v0.1. Accessed 2026-05-29. https://www.mecfsatlas.com/evidence/zachrisson-2002-rating-scale
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