TY - JOUR T1 - The Prevalence of Rheumatoid Arthritis in Chile: A Nationwide Study Performed as Part of the National Health Survey JF - The Journal of Rheumatology JO - J Rheumatol SP - 951 LP - 958 DO - 10.3899/jrheum.190396 VL - 47 IS - 7 AU - Josefina Durán AU - Loreto Massardo AU - Carolina Llanos AU - Sergio Iacobelli AU - Paula I. Burgos AU - Marcela Cisternas AU - Mirentxu Iruretagoyena AU - Macarena Armstrong AU - Raquel Aguilera AU - Francisco Radrigán AU - María Eugenia Martinez AU - Alvaro Passi-Solar AU - Pablo Riedemann AU - Natalia Crisóstomo AU - Camila Cifuentes AU - Lucero Hagedorn AU - Alvaro Cisternas AU - Nancy Vasquez AU - Paula Margozzini AU - the ENS2017 Study Group Y1 - 2020/07/01 UR - http://www.jrheum.org/content/47/7/951.abstract N2 - Objective. 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.Methods. 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 > 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.Results. 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 0.3–1.2). Prevalence was higher in women, and 3.3% of subjects self-reported having RA.Conclusion. According to this national population-based study, RA prevalence in Chile is 0.6% (0.3–1.2), 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. ER -