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Mayo Clinic determines lifetime risk of adult rheumatoid arthritis
Date:1/5/2011

ROCHESTER, Minn. -- Mayo Clinic researchers have determined the lifetime risk of developing rheumatoid arthritis and six other autoimmune rheumatic diseases for both men and women. The findings appear online in Arthritis and Rheumatism.

VIDEO ALERT: Additional audio and video resources, including excerpts from an interview with Cynthia Crowson describing the research, are available on the Mayo Clinic News Blog(http://newsblog.mayoclinic.org/2011/01/05/whats-your-risk-of-developing-rheumatoid-arthritis/)

"We estimated the lifetime risk for rheumatic disease for both sexes, something that had not been done before -- separately or collectively," says Cynthia Crowson Mayo Clinic biostatistician and first author. "Prevalence and incidence rates existed, but prevalence figures underestimate individual risk and incidence rates express only a yearly estimate."

The researchers were looking for an accurate basis to offer an easy-to-understand average risk over a person's lifetime, knowing that risk changes at almost every age. They used data from the Rochester Epidemiology Project, a long-term epidemiology resource based on patients in Olmsted County, Minn. The cohort of 1179, consisted of patients diagnosed between 1955 and 2007, allowed the team to extrapolate the nationwide estimates.

The adult lifetime risk in the United States of having some kind of inflammatory autoimmune disease is 8.4 percent for women and 5.1 percent for men. Based on year 2000 population figures, that means one woman in 12 and one man in 20 will develop one of the conditions in their lifetime. The authors consider that a substantial risk and say their findings should encourage more research on the value of early diagnosis and intervention for people with increased genetic risk of arthritis. They hope the new figures will help in counseling patients and in fundraising efforts to find improved treatments.

The figures below reflect lifetime risk for the respective diseases, based on the Mayo findings.

 Disease   Women
 Men 
Rheumatoid Arthritis (RA)  3.6% or 1 in 28   1.7% or 1 in 59 
Polymyalgia Rheumatica 2.4% 1.7%
Systemic Lupus Erythematosus .9% .2%
Giant Cell Arteritis 1% .5%
Psoriatic Arthritis .5% .6%
Primary Sjgrens syndrome .8% .04%
Ankylosing Spondylitis .1% .6%


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Contact: Robert Nellis
newsbureau@mayo.edu
507-284-5005
Mayo Clinic
Source:Eurekalert

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