title: The prevalence of rheumatoid arthritis in the Qassim region of Saudi Arabia.
abstract: BACKGROUND
  Although rheumatoid arthritis (RA) of varying degrees of severity has been seen in our clinics, there is no statistical evidence of the magnitude of the problem in Saudi nationals. We conducted this study to determine the prevalence of RA in the Al Qassim Region of Saudi Arabia.
  
  
  METHODS
  Five thousand eight hundred and ninety-one Saudi adults, aged 16 years and over, were studied in a house-to-house survey in the Al Qassim Region.
  
  
  RESULTS
  Of the 5891 adults studied, 13 cases of RA were identified, using the criteria set for the diagnosis of RA by the American College of Rheumatology. Thirty-five percent of our patients showed positive rheumatoid factor.
  
  
  CONCLUSIONS
  The prevalence of RA in Al Qassim was estimated at 2.2 per thousand people. It was also noted that the prevalence of the disease increased with age, and that it was more common in females.
authors.affiliation: Departments of Medicine and Pediatrics, King Faisal Specialist Hospital and Research Centre, College of Medicine, King Saud University, Ministry of Health, Riyadh, and Department of Medicine, King Fahad Specialist Hospital, Al Qassim, Saudi Arabia.
authors.forename: A
authors.initials: A
authors.lastname: Al-Dalaan
authors.forename: S
authors.initials: S
authors.lastname: Al Ballaa
authors.forename: S
authors.initials: S
authors.lastname: Bahabri
authors.forename: T
authors.initials: T
authors.lastname: Biyari
authors.forename: M
authors.initials: M
authors.lastname: Al Sukait
authors.forename: M
authors.initials: M
authors.lastname: Mousa