Abstract
Background: The prevalence of inclusion body myositis (IBM) is variable in different populations and ethnic groups. Previous surveys revealed that the prevalence in Caucasians is 5–15 per million. The prevalence of IBM in Asian people including Japanese has not been elucidated. Method: We estimated the number of IBM by comparing the number of IBM with polymyositis (PM) diagnosed at the National Center of Neurology and Psychiatry (NCNP). The number of PM is calculated from national survey in Japan.
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