Polymyositis and dermatomyositis epidemiology and demographics

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Editor-In-Chief: C. Michael Gibson, M.S., M.D. [1]; Associate Editor(s)-in-Chief:

Overview

The incidence of polymyositis and dermatomyositis is approximately 2 per 100,000 individuals worldwide.^[1]
In 2010, the incidence of polymyositis and dermatomyositis was estimated to be 1-1.3 cases per 100,000 individuals in Japan annually.^[2]

The prevalence of polymyositis and dermatomyositis is approximately 5-22 per 100,000 individuals worldwide.^[1]
In 2003, the prevalence of polymyositis and dermatomyositis was estimated to be 21.5 cases per 100,000 individuals in Quebec.^[3]
In 2010, the prevalence of polymyositis and dermatomyositis was estimated to be 13.2 cases per 100,000 individuals in Japan.^[2]

In [year], the incidence of [disease name] is approximately [number range] per 100,000 individuals with a case-fatality rate/mortality rate of [number range]%.
The case-fatality rate/mortality rate of [disease name] is approximately [number range].
The 5-year survival rate for polymyositis is 75% and for dermatomyositis is 63%.^[2]
The median survival for polymyositis is 11.0 years and that for dermatomyositis is 12.3 years.^[2]

Patients of all age groups may develop polymyositis and dermatomyositis.
Dermatomyositis commonly affects both children and adults.^[4]
Polymyositis is rare among children.^[4]
Polymyositis and dermatomyositis commonly affects patients in 40-50 years of age.

There is no racial predilection to [disease name].
[Disease name] usually affects individuals of the [race 1] race. [Race 2] individuals are less likely to develop [disease name].

Females are more commonly affected by polymyositis and dermatomyositis than males. The female to male ratio is approximately 2 to 1.

Prevalence of polymyositis and dermatomyositis are lower in young rural men and higher in older urban women.^[5]

↑ ^1.0 ^1.1 Jacobson DL, Gange SJ, Rose NR, Graham NM (September 1997). "Epidemiology and estimated population burden of selected autoimmune diseases in the United States". Clin. Immunol. Immunopathol. 84 (3): 223–43. PMID 9281381.
↑ ^2.0 ^2.1 ^2.2 ^2.3 Airio, A.; Kautiainen, H.; Hakala, M. (2006). "Prognosis and mortality of polymyositis and dermatomyositis patients". Clinical Rheumatology. 25 (2): 234–239. doi:10.1007/s10067-005-1164-z. ISSN 0770-3198.
↑ Bernatsky, S; Joseph, L; Pineau, C A; Belisle, P; Boivin, J F; Banerjee, D; Clarke, A E (2008). "Estimating the prevalence of polymyositis and dermatomyositis from administrative data: age, sex and regional differences". Annals of the Rheumatic Diseases. 68 (7): 1192–1196. doi:10.1136/ard.2008.093161. ISSN 0003-4967.
↑ ^4.0 ^4.1 Dalakas, Marinos C; Hohlfeld, Reinhard (2003). "Polymyositis and dermatomyositis". The Lancet. 362 (9388): 971–982. doi:10.1016/S0140-6736(03)14368-1. ISSN 0140-6736.
↑ Bernatsky, S; Joseph, L; Pineau, C A; Belisle, P; Boivin, J F; Banerjee, D; Clarke, A E (2008). "Estimating the prevalence of polymyositis and dermatomyositis from administrative data: age, sex and regional differences". Annals of the Rheumatic Diseases. 68 (7): 1192–1196. doi:10.1136/ard.2008.093161. ISSN 0003-4967.