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Is rheumatoid arthritis disappearing?

Department of Rheumatology, Diakonhjemmet Hospital, N-0319 Oslo, Norway

Correspondence to:
Correspondence to:
Dr T Uhlig
Department of Rheumatology, Diakonhjemmet Hospital, N-0319 Oslo, Norway; till.uhlig{at}nrrk.no

ABSTRACT
During the past decades a number of studies have examined the incidence of rheumatoid arthritis (RA) in different geographical settings and at different times. Some studies from the 1970s and 1980s reported a higher incidence of RA than seen during recent years, where reported incidence numbers seems to have flattened out at a lower level. Besides a real time dependent decline of RA incidence, changing methodology in classification may be an equally important explanation. Today we may assume that annually 25–50 people from a population of 100 000 will develop typical RA.

Keywords: rheumatoid arthritis; incidence; age; geography; time

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