Jason, Leonard A, So, Suzanna, Brown, Abigail A et al. · Fatigue : biomedicine, health & behavior · 2015 · DOI
Researchers tested whether the DePaul Symptom Questionnaire (DSQ)—a tool designed to help doctors diagnose ME/CFS—gives consistent results when used multiple times. They asked 26 people with ME/CFS and 25 healthy people to answer the same questions at different times. The questionnaire proved reliable, meaning patients' answers were consistent, making it a trustworthy tool for identifying who has ME/CFS.
A reliable diagnostic tool is essential for ME/CFS, where diagnosis is often delayed or missed due to lack of standardized assessment methods. The DSQ's reliability suggests it can help clinicians and researchers consistently identify patients who meet diagnostic criteria, potentially improving access to appropriate care and enabling more rigorous research enrollment.
This study demonstrates consistency of the DSQ but does not prove it is valid for diagnosing ME/CFS—reliability (consistency) and validity (accuracy) are different properties. The study does not establish whether the DSQ correctly distinguishes ME/CFS from other conditions, nor does it determine whether patient self-identification matches clinical diagnostic criteria.
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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