Myalgic encephalomyelitis and chronic fatigue syndrome case definitions: effects of requiring a substantial reduction in functioning.
Samantha ScartozziMadison SunnquistLeonard A JasonPublished in: Fatigue : biomedicine, health & behavior (2019)
These results suggest that the requirement of a substantial reduction in functioning may be redundant when case definitions specify that individuals must endorse a set of core symptoms at specified frequency and severity levels.