Article Figures & Tables
Figures
- Figure 1:
Raw seroprevalence by province for all time periods and provinces. Error bars indicate 95% confidence intervals. Data for this figure are available in Appendix 2 (available at www.cmajopen.ca/content/11/2/E305/suppl/DC1).
- Figure 2:
Age-stratified seroprevalence for time period C (Nov. 16–Dec. 4, 2020) for each province. Error bars indicate 95% confidence intervals, and those that extend past 20% (resulting from small numbers in this age group) have been cut off for ease of visual comparison among provinces.
- Figure 3:
Location of positive and negative antenatal serum results for SARS-CoV-2 for time period C (Nov. 16–Dec. 4, 2020). Blue crosses indicate seropositive samples and red crosses indicate seronegative samples. Regional mapping of samples was not possible for samples from Alberta, New Brunswick and Newfoundland and Labrador. Numbers indicate raw seroprevalence.
- Figure 4:
Longitudinal assessment of seroprevalence over time for British Columbia during the Omicron period (Nov. 15, 2021–June 11, 2022). Generalized additive model estimated degrees of freedom = 4.2, p < 0.0001. Shaded area indicates 95% confidence intervals around the estimated seroprevalence.
Tables
- Table 1:
Comparison of rates of positive infection confirmed by polymerase chain reaction testing among pregnant people from CANCOVID-Preg, and among females aged 20–49 years from StatCan region for time period C (Nov. 16–Dec. 4, 2020) and results of SARS-CoV-2 sero-screening adjusted for age (November and December 2020)*
Region Province Raw seroprevalence (95% CI) PCR-positive rate in pregnant people (95% CI) Rate ratio (95% CI) Age-adjusted seroprevalence (95% CI) PCR-positive rate in region-specific females aged 20–49 yr (95% CI) Rate ratio (95% CI) 1 British Columbia 2.14 (1.63–2.74) 0.62 (0.55–0.70) 3.44 (2.57–4.48) 1.87 (1.12–2.80) 1.13 (1.12–1.16) 1.84 (1.37–2.36) 2 Alberta 2.07 (1.63–2.59) 0.86 (0.78–0.95) 2.40 (1.84–3.02) 1.78 (1.20–2.47) 2.11 (2.08–2.13) 0.85 (0.65–1.06) 2 Saskatchewan 1.81 (1.06–2.88) – – 1.29 (0.62–2.19) 2.11 (2.08–2.13) 0.61 (0.30–0.96) 2 Manitoba 4.28 (1.86–8.26) 1.24 (1.08–1.44) 3.44 (1.28–6.11) 5.62 (1.42–12.42) 2.11 (2.08–2.13) 2.79 (1.27–4.55) 3 Ontario 3.86 (3.39–4.38) 0.47 (0.43–0.51) 8.25 (7.13–9.48) 5.67 (3.93–7.50) 1.28 (1.27–1.29) 4.42 (3.97–4.87) 4 Quebec 5.38 (4.19–6.80) 1.01 (0.94–1.08) 5.33 (4.06–6.68) 5.95 (2.66–10.44) 2.45 (2.42–2.47) 2.43 (1.90–2.99) 5 Nova Scotia 1.41 (0.57–2.88) 0.17 (0.09–0.30) 8.27 (2.56–20.47) 0.96 (0.33–1.90) 0.11 (0.10–0.12) 8.90 (1.80–17.28) 5 Newfoundland and Labrador 0.33 (0.01–1.80) 0.00 (0.00–0.13) –† 0.24 (0.01–0.87) 0.11 (0.10–0.12) 2.88 (0.00–9.02) 5 New Brunswick 1.01 (0.12–2.59) 0.05 (0.01–0.15) 15.69 (2.64–93.37) 0.91 (0.09–2.65) 0.11 (0.10–0.12) 8.93 (0.00–22.79) 5 Prince Edward Island 1.11 (0.03–6.04) 0.00 (0.00–0.36) –† 1.11 (0.03–6.04) 0.11 (0.10–0.12) 9.83 (0.00–30.97) Note: CANCOVID-Preg = COVID-19 in Pregnancy: Epidemiology, Maternal and Infant Outcomes, CI = confidence interval, PCR = polymerase chain reaction, StatCan = Statistics Canada.
↵* Rate ratios shown for comparison with raw rates for the pregnant population, and age-adjusted seroprevalence estimates for the general female population. Rate for Prince Edward Island is not age adjusted. Shown as rates per 100. PCR-positive rates not available for pregnant people in Saskatchewan.
↵† Rate ratio not possible to calculate.
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