Centre | N | Observation period | Enrolment period | Inclusion criteria |
---|---|---|---|---|
Children's Hospital, Health Sciences Centre, Winnipeg, Manitoba | 816 | 1999–2008 | 1974–2007 | ILAR |
Royal University Hospital, Saskatoon, Saskatchewan | 364 | 1995–2009 | 1981–2011 | 1981–1998: ACR 1999–2011: ILAR |
The Toronto Hospital for Sick Children, Toronto, Ontario | 1722 | 1978–2012 | 1974–2013 | ILAR |
The Montreal Children's Hospital, Montreal, Quebec | 656 | 1995–2006 | 1991–2010 | ILAR |
The Seattle Children's Hospital, Seattle, Washington | 1602 | 2003–2011 | 2003–2012 | Administrative database data using ICD-9 codes |
The Children's Hospital at Oklahoma University Medical Center, Oklahoma | 134 | 1999–2008 | 1996–2011 | ACR |
Total | 5294 |
ACR, American College of Rheumatology criteria for juvenile rheumatoid arthritis; ICD-9, International Classification of Diseases, Ninth Revision; ILAR, International League of Associations for Rheumatology criteria for juvenile idiopathic arthritis.