{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,2,17]],"date-time":"2026-02-17T14:37:31Z","timestamp":1771339051229,"version":"3.50.1"},"reference-count":42,"publisher":"The Journal of Rheumatology","issue":"7","content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["J Rheumatol"],"published-print":{"date-parts":[[2020,7,1]]},"abstract":"<jats:sec><jats:title>Objective.<\/jats:title><jats:p>Genetic and environmental backgrounds influence the development of rheumatoid arthritis (RA). In Latin America, epidemiologic data are scarce. We aimed to determine the prevalence of RA in Chile in a population-based study.<\/jats:p><\/jats:sec><jats:sec><jats:title>Methods.<\/jats:title><jats:p>The National Health Survey was a cross-sectional household survey with a stratified multistage probability sample of 6233 participants performed between August 2016 and March 2017. A screening instrument for RA was applied to a random sample of 3847 subjects &gt; 30 years old. Positive screening was defined by at least 1 of the following: 2 swollen joints for at least 4 consecutive weeks (past\/present), and\/or a diagnosis of arthritis in the past. Individuals with positive screening had rheumatoid factor, anticitrullinated protein antibodies, and C-reactive protein measured, as well as clinical examination performed by a rheumatologist. Self-report of doctor-diagnosed RA was also performed.<\/jats:p><\/jats:sec><jats:sec><jats:title>Results.<\/jats:title><jats:p>The screening questionnaire was applied to 2998 subjects. A positive screening was found for 783 (22.1%). Among subjects with positive screening, 493 (66%) had a clinical evaluation performed by a rheumatologist. Using the American College of Rheumatology\/European League Against Rheumatism 2010 classification criteria, prevalence was 0.6% (95% CI 0.3\u20131.2). Prevalence was higher in women, and 3.3% of subjects self-reported having RA.<\/jats:p><\/jats:sec><jats:sec><jats:title>Conclusion.<\/jats:title><jats:p>According to this national population-based study, RA prevalence in Chile is 0.6% (0.3\u20131.2), a value similar to what has been found in developed countries and slightly lower than some Latin American countries. Self-reporting leads to overestimating RA.<\/jats:p><\/jats:sec>","DOI":"10.3899\/jrheum.190396","type":"journal-article","created":{"date-parts":[[2019,9,1]],"date-time":"2019-09-01T16:19:08Z","timestamp":1567354748000},"page":"951-958","source":"Crossref","is-referenced-by-count":11,"title":["The Prevalence of Rheumatoid Arthritis in Chile: A Nationwide Study Performed as Part of the National Health 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