Table 1: Characteristics of the regional networks and sentinel primary care practices participating in the Canadian Primary Care Sentinel Surveillance Network as of Dec. 31, 2012

Regional network	Province	City, university affiliation	No. of sentinel practices		No. of patients overall*
Regional network	Province	City, university affiliation	Total	Rural	No. of patients overall*
British Columbia Primary Care Research Network (BCPCReN)	British Columbia	Vancouver, University of British Columbia	13	0	8 744
Alberta Family Practice Research Network (AFPRN)	Alberta	Edmonton, University of Alberta	35	0	15 211
Southern Alberta Primary Care Research Network (SAPCReN)	Alberta	Calgary, University of Calgary	52	16	32 000
Manitoba Primary Care Research Network (MaPCReN)	Manitoba	Winnipeg, University of Manitoba	32	4	27 618
Deliver Primary Healthcare Information Project (DELPHI)	Ontario	London, Western University	21	5	16 995
University of Toronto Practice Based Research Network (UTOPIAN)	Ontario	Toronto, University of Toronto	130	0	61 264
Eastern Ontario Network (EON)	Ontario	Kingston, Queen’s University	46	14	26 011
Primary Care Research Network of the University of Montréal (PCRNUM)	Quebec	Montréal, University of Montréal	25	0	4 961
Maritime Family Practice Research Network (MARNET-FP)	Nova Scotia	Halifax, Dalhousie University	43	19	33 811
Atlantic Practice Based Research Network (APBRN)	Newfoundland and Labrador	St. John’s, Memorial University of Newfoundland	47	2	23 631

*Patients who had at least 1 clinical encounter at a participating practice during the 2 years before the study.