Welch, David C, Edwards, Charles C, Broussard, Camille A et al. · Brain, behavior, & immunity - health · 2026 · DOI
This study tested whether a questionnaire called the Wood Mental Fatigue Inventory (WMFI) works well for measuring brain fog and cognitive problems in teenagers with ME/CFS. Researchers compared it to another commonly used teen fatigue scale and found that both questionnaires measured mental fatigue similarly and could track changes over time as teenagers received treatment.
Measuring cognitive dysfunction reliably is essential for diagnosing ME/CFS, tracking disease progression, and evaluating treatment responses in adolescents. This study validates the WMFI as a practical tool for clinicians and researchers working with teen ME/CFS patients, potentially enabling more standardized assessment across age groups and treatment settings.
This study demonstrates correlation between assessment tools but does not establish whether either questionnaire directly measures underlying biological mechanisms of cognitive dysfunction in ME/CFS. The small sample size (55 per group) and use of self-report measures limits generalizability. Additionally, the study does not determine whether improvements in questionnaire scores reflect true functional recovery or subjective perception changes.
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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