Rheumatoid Arthritis
Incidence and risk factorsIncidence Anyone can get rheumatoid arthritis, including children and the
elderly. However, the disease usually begins in the young to middle
adult years. Among people with RA, women outnumber men by 3-to-1. In
the United States, approximately one percent of the population, or 2.5
million people, have rheumatoid arthritis. It occurs in all ethnic
groups and in all parts of the world.
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