Research articles: the 2005 Empirical Definition of chronic fatigue syndrome

In 2005, the US Centers for Disease Control (CDC) created a controversial new definition of chronic fatigue syndrome – the ‘Empirical’ definition.

The following articles on the topic were written by Cort Johnson and form part of the Phoenix Rising research archive.

• Hitting A Moving Target I: Defining and Quantifying CFS: the New Prevalence Estimates (2008) An overview of the CDC’s efforts to define CFS, the controversy over the new definition and a look at what it may hold for CFS.

• Hitting a Moving Target II: More on The Empirical Definition and CFS (2008) Further examination of the Empirical Definition.