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

2008; National Institutes of Health; Volume: 35; Issue: 3 Linguagem: Inglês

Floranne C. Wilson, Steven R. Ytterberg, Jennifer L. St. Sauver, Ann M. Reed,

Inflammatory Myopathies and Dermatomyositis

To determine the incidence and prevalence of sporadic inclusion body myositis (sIBM) and polymyositis (PM) in a population-based study.Charts of patients with myositis in Olmsted County, Minnesota, USA, from 1981 to 2000 were reviewed.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.The incidence and prevalence rates for sIBM are higher than previously reported.