title: The incidence of juvenile rheumatoid arthritis in Quebec: a population data-based study.
abstract: OBJECTIVE
  To determine the population incidence of juvenile rheumatoid arthritis (JRA) in Quebec.
  
  
  METHODS
  We obtained data from Quebec's physician claims database. Incident cases were defined as having a visit for JRA in 2000, no visit in the previous 3 years, a confirmed diagnosis by an arthritis specialist, or having >/= 2 visits to any physician for JRA, >/= 2 months apart but within 2 years.
  
  
  RESULTS
  Cumulative incidence of JRA was 17.8/100,000. Mean age at diagnosis was 9.8 +/- 4.6 years, 68% were female and more persons were diagnosed in winter. Subjects had a median of 10 medical visits over the first year.
  
  
  CONCLUSIONS
  Our population based incidence estimate was similar to others. Children and adolescents with JRA are heavy users of medical care. Additional study of environmental or climate- related triggers may be warranted.
authors.affiliation: Université de Montréal, Interdisciplinary Research Centre in Rehabilitation, and Public Health Department of Montreal, Pavillon 7077 du Parc, CP 6128, Succ Centre-ville, Montréal, Qc H3C 3J7, Canada. debbie.feldman@umontreal.ca.
authors.forename: Debbie
authors.initials: D
authors.lastname: Ehrmann Feldman
authors.forename: Sasha
authors.initials: S
authors.lastname: Bernatsky
authors.forename: Michelle
authors.initials: M
authors.lastname: Houde