Prevalence of Chronic Fatigue Syndrome (CFS) in a community population in Japan

In order to know the prevalence of chronic fatigue syndrome
(CFS) in a community population in Japan, we analyzed data
from a population-based interview survey. Two cases out of 137
respondents experienced chronic fatigue during a period of
nine months, suffered from 50% or more reduction of daily
activity due to fatigue and had no other physical or
psychiatric diagnosis. Both of the two cases fulfilled the
1994 Centers for Disease Control (CDC) criteria and the
British criteria. The point and nine-month prevalence rates of
CFS were both 1.5% (95% confidence intervals, 0.4-5.2%). None
fulfilled the 1989 CDC criteria for CFS. The prevalence rate
of CFS was higher than those in previous studies in the
Western countries, suggesting a need for future research on
cross- cultural differences in the definition, prevalence and
symptomatology of CFS.

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