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Giant cell arteritis (GCA) is a granulomatous vasculitis of large and medium-sized arteries that occurs in individuals aged ≥50 years.1 A recent study suggested that the age at incidence of GCA may be increasing.2 To address this issue, we studied the trends in mean age at onset of GCA over a 55-year period.
A population-based incident cohort of 173 patients with GCA diagnosed between 1 January 1950 and 31 December 1999 has been established using the resources of the Rochester Epidemiology Project.3 4 We extended the cohort to include 34 new cases of GCA diagnosed between 1 January 2000 and 31 December 2004. Patients were included in the study if they fulfilled the 1990 American College of Rheumatology criteria.5 Age- and sex-specific incidence rates were calculated based …
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