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.