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. 2008 Mar;35(3):445-7.
Epub 2008 Jan 15.

Epidemiology of sporadic inclusion body myositis and polymyositis in Olmsted County, Minnesota

Floranne C Wilson  1 , Steven R Ytterberg, Jennifer L St Sauver, Ann M Reed
Affiliations
  • PMID: 18203321

Epidemiology of sporadic inclusion body myositis and polymyositis in Olmsted County, Minnesota

Floranne C Wilson et al. J Rheumatol. 2008 Mar.

Abstract

Objective: To determine the incidence and prevalence of sporadic inclusion body myositis (sIBM) and polymyositis (PM) in a population-based study.

Methods: Charts of patients with myositis in Olmsted County, Minnesota, USA, from 1981 to 2000 were reviewed.

Results: For sIBM, the age- and sex-adjusted incidence rates per 100,000 were 0.79 (95% confidence interval = 0.24-1.35), and for PM, 0.41 (95% CI 0.08-0.73). The age- and sex-adjusted prevalence rates per 100,000 were 7.06 (95% CI 0.87-13.24) for sIBM and 3.45 (95% CI 0.00-7.35) for PM.

Conclusion: The incidence and prevalence rates for sIBM are higher than previously reported.

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