title: The prevalence of rheumatoid arthritis in Argentina: a capture-recapture study in a city of Buenos Aires province.
abstract: OBJECTIVE
  The objective of this study was to assess the prevalence of rheumatoid arthritis (RA) in the population of a city of 70,000 inhabitants located in Buenos Aires, Argentina.
  
  
  METHODS
  Based on the hypothesis that RA is an underdiagnosed disease in Argentina, a capture-recapture method was applied. A local registry of RA patients of Luján City was taken as the primary source; a telephone survey was specifically carried out as a secondary source of information. Patients suspected of having RA were referred to a local hospital to be examined by a team of 12 rheumatologists. Anamnesis and physical examination were followed by hand and foot radiography and erythrocyte sedimentation rate and rheumatoid factor measurements.
  
  
  RESULTS
  According to the American College of Rheumatology criteria, a prevalence rate of 0.94% (95% confidence interval [CI], 0.86%-1.02%) was found in the surveyed population; in agreement with other studies, this prevalence was higher in women when compared with men (for female, 1.54% [95% CI, 1.40%-1.69%]; for male, 0.40% [95% CI, 0.32%-0.49%]).
  
  
  CONCLUSIONS
  The prevalence of RA in a representative sample of the population of a city from the central region of Argentina seems to be close to 1%.
authors.affiliation: University of Buenos Aires, Argentina. dscublin@yahoo.com.ar
authors.forename: Dario
authors.initials: D
authors.lastname: Scublinsky
authors.forename: Horacio
authors.initials: H
authors.lastname: Venarotti
authors.forename: Gustavo
authors.initials: G
authors.lastname: Citera
authors.forename: Osvaldo D
authors.initials: OD
authors.lastname: Messina
authors.forename: Eduardo
authors.initials: E
authors.lastname: Scheines
authors.forename: Oscar
authors.initials: O
authors.lastname: Rillo
authors.forename: Alfredo
authors.initials: A
authors.lastname: Arturi
authors.forename: Julio
authors.initials: J
authors.lastname: Hofman
authors.forename: Luis F
authors.initials: LF
authors.lastname: Somma
authors.forename: Gustavo
authors.initials: G
authors.lastname: Casado
authors.forename: Rubén F
authors.initials: RF
authors.lastname: Iannantuono
authors.forename: Claudio D
authors.initials: CD
authors.lastname: Gonzalez
mesh_terms: D000293:Adolescent; D000328:Adult; D017677:Age Distribution; D000368:Aged; D001118:Argentina / Q000453:epidemiology; D001172:Arthritis, Rheumatoid / Q000175:diagnosis / Q000453:epidemiology*; D003430:Cross-Sectional Studies; D005260:Female; D006306:Health Surveys; D006801:Humans; D008297:Male; D008875:Middle Aged; D015995:Prevalence; D012042:Registries; D017678:Sex Distribution; D014504:Urban Health; D055815:Young Adult