How does the incidence of polymyositis vary by age?

Updated: Jan 05, 2021
  • Author: Mythili Seetharaman, MD; Chief Editor: Herbert S Diamond, MD  more...
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Polymyositis usually affects adults older than 20 years, especially those aged 45-60 years. Polymyositis rarely affects children. The age of onset of polymyositis with another collagen vascular disease is related to the associated condition.

Although dermatomyositis is primarily a disease of adults, it also is observed in children, usually those aged 5-14 years. Eighty percent of patients with inclusion body myositis are older than 50 years at onset.

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