Table 1:

Sources of data on Canadian population seroprevalence and sample descriptors

Study source	Canadian Blood Services	Héma-Québec	Alberta Precision Laboratories	Manitoba Seroprevalence	Saskatchewan Seroprevalence	Canadian Partnership for Tomorrow’s Health	Action to Beat Coronavirus
Data source type	Blood donors	Blood donors	Provincial serosurvey^†	Provincial serosurvey^†	Provincial serosurvey^†	Research cohort	Research cohort
Reporting frequency	Monthly/weekly	Quarterly	Bi-monthly	Monthly	Monthly	Monthly	Quarterly
No. of estimates contributed^*	835	35	78	43	84	89	34
Female, %	42	39	55	50	62.5	67	59
Total no. of blood samples	640 315	12 754	184 986	17 598	21 886	41 825	31 933
Age range, yr	≥ 17	≥ 18	≥ 0	≥ 1	≥ 0	22–93	≥ 18
Population standardization	Region, age, sex	Region, age, sex	Region, age, sex	Region, age, sex	Region, age, sex	None	Sampling and post-stratification weights (age and education)
Provincial coverage	British Columbia, Alberta, Saskatchewan, Manitoba, Ontario, New Brunswick, Nova Scotia, Prince Edward Island, Newfoundland and Labrador	Quebec	Alberta	Manitoba	Saskatchewan	British Columbia, Manitoba, Ontario, Quebec, Atlantic (New Brunswick, Nova Scotia, Prince Edward Island, Newfoundland and Labrador)	British Columbia, Yukon,^‡ Ontario, Quebec

↵* Number of estimates include provincial estimates and age-stratified estimates, if provided.
↵† Provincial serosurvey: anonymized discarded or residual blood samples from provincial laboratories.
↵‡ Yukon estimates categorized as British Columbia in plotting.