How common are Polymyositis and dermatomyositis

Sharing is caring!

How common are Polymyositis and dermatomyositis

What are some of the epidemiologic features of Polymyositis and dermatomyositis?

• Annual incidence of 2–19 cases/million.

• Peak age of onset is bimodal in distribution for DM: one peak at 5 to 15 years of age, and the other at 45 to 65 years. PM rarely occurs in patients aged <15 years, with mean age of onset 50 to 60 years.

• The female to male ratio is 2 to 3:1 overall. The female to male ratio in JDM is close to 1:1. In overlap myositis associated with other connective tissue disorders it is 8 to 10:1.

• In the United States, African-Americans are affected more commonly than Caucasians at a ratio of 3 to 4:1 in some studies.

Sharing is caring!

You cannot copy content of this page


Sign up to receive the trending updates and tons of Health Tips

Join SeekhealthZ and never miss the latest health information

Scroll to Top