Beth Karlson provided an overall review of RA epidemiology so as to compare to our i2b2 work. Among the interesting facts I learned: In the Nurse's Health Study only 6% of the self-reported cases of RA were validated by the expert reviewers. Described relative risk of smoking with regard to RA is approximately 1.4 and is an effect that take appears to only taper off with about 20 years of smoking cessation.
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