Tiersky, L A, DeLuca, J, Hill, N et al. · Applied neuropsychology · 2001 · DOI
Researchers tracked 35 people with ME/CFS over about 3.5 years to see how they changed over time. They found that attention, mood, fatigue, and disability improved somewhat during this period. However, most people remained significantly disabled and unemployed at the end of the study, suggesting that while some aspects may get better, ME/CFS typically leaves people unable to work long-term.
This study provides evidence that some ME/CFS symptoms and cognitive function may improve over time, offering patients realistic hope for partial recovery. However, it also demonstrates that functional improvement does not typically translate to return-to-work status, highlighting the persistent disabling nature of the condition and the need for better rehabilitation and employment support strategies.
This study does not establish causation or mechanisms underlying improvement—only that change occurs in certain domains. The small sample size and lack of control group limit generalizability, and the study does not define what 'improvement' means clinically or whether participants ever fully recovered normal functioning. The findings apply only to those meeting 1988/1994 CDC criteria and may not represent more recent or broader diagnostic definitions.
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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