Ciccone, Donald S, Chandler, Helena K, Natelson, Benjamin H · The Journal of nervous and mental disease · 2010 · DOI
This study followed 94 women with ME/CFS for 2.5 years to see who improved and who didn't. Researchers found that people who got better had less fatigue, pain, and disability over time, while those who didn't improve stayed relatively unchanged. Importantly, people who had both ME/CFS and fibromyalgia at the start were much less likely to improve.
This study provides evidence that ME/CFS outcomes vary substantially between patients and identifies fibromyalgia as a prognostic factor that significantly worsens long-term outcomes. Understanding which patients are at higher risk of non-improvement could help clinicians identify those needing more intensive or tailored interventions.
This study does not establish causation—it shows that fibromyalgia is associated with worse outcomes but does not prove why. The study cannot explain the mechanism linking FM to non-improvement, and findings are limited to female patients seeking care at tertiary clinics, so results may not apply to all ME/CFS populations. The study also does not define what constitutes 'improvement' in objective biological terms.
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 →
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