Table 2.
Seroprevalence of SARS-CoV-2 in four periods (May, August, October, and December) 2020, by age group, sex, region and type of municipality
| Maya (n = 2512) | August (n = 11 478) | October (n = 9654) | December (n = 4044) | |||||
|---|---|---|---|---|---|---|---|---|
| % | (95% CI) | % | (95% CI) | % | (95% CI) | % | (95% CI) | |
| Total | 1.2 | (0.3–1.9) | 2.1 | (1.3–2.6) | 2.2 | (1.5–2.9) | 4.1 | (3.1–4.9) |
| Adjustedb total | 1.5 | (0.9–2.1) | 2.0 | (1.7–2.4) | 2.4 | (1.9–2.8) | 4.3 | (3.4–5.1) |
| Age group | ||||||||
| 12–17 years | 1.0 | (0–2.4) | 2.9 | (1.4–4.6) | 6.5 | (3.8–10) | ||
| 18–39 years | 2.3 | (1.1–3.7) | 2.9 | (1.9–3.7) | 3.3 | (2.3–4.3) | 5.3 | (3.8–6.8) |
| 40–64 years | 0.6 | (0.0–1.5) | 2.0 | (1.2–2.6) | 2.0 | (1.2–2.7) | 3.6 | (2.5–4.7) |
| 65 + years | 0.6 | (0.0–2.1) | 1.5 | (0.6–2.3) | 1.2 | (0.3–2.0) | 2.3 | (1.0–4.0) |
| Sex | ||||||||
| Female | 0.9 | (0.3–1.8) | 2.1 | (1.3–2.8) | 2.0 | (1.2–2.7) | 4.2 | (3.0–5.2) |
| Male | 1.5 | (0.5–2.6) | 2.0 | (1.1–2.6) | 2.6 | (1.7–3.3) | 4.0 | (2.8–5.2) |
| Region | ||||||||
| Capital | 1.8 | (0.7–3.0) | 3.2 | (2.3–4.0) | 3.3 | (2.3–4.1) | 5.0 | (3.7–6.3) |
| Zealand | 1.9 | (0.2–4.6) | 1.9 | (0.9–2.8) | 1.4 | (0.4–2.3) | 4.0 | (2.3–6.1) |
| South | 0.7 | (0–2.5) | 1.6 | (0.6–2.4) | 1.7 | (0.7–2.6) | 3.3 | (1.8–5.0) |
| Mid Jutland | 0.3 | (0–1.6) | 1.3 | (0.4–2.0) | 2.0 | (1.0–2.9) | 3.6 | (2.1- 5.3) |
| North Jutland | 0.6 | (0–2.6) | 1.2 | (0.3–2.2) | 1.6 | (0.5–2.7) | 3.1 | (1.3–5.5) |
| Type of area (municipality) | ||||||||
| Capital | 1.8 | (0.7–2.9) | 3.3 | (2.3–4.1) | 3.5 | (2.5–4.4) | 5.6 | (4.2–7.1) |
| Metropolitan | 0.9 | (0–2.1) | 1.8 | (0.8–2.7) | 1.5 | (0.5–2.5) | 4.9 | (3.1–7.1) |
| Provincial | 3.2 | (0.7–8.0) | 1.5 | (0.6–2.3) | 2.3 | (1.3–3.2) | 3.6 | (2.1–5.1) |
| Commuter | 0 | (0–1.3) | 1.9 | (0.9–2.8) | 0.8 | (0–1.6) | 3.3 | (1.8–5.3) |
| Rural | 0 | (0–1.2) | 1.0 | (0.1–1.8) | 1.8 | (0.8–2.7) | 1.3 | (0.2–2.9) |
aIncludes only people 18 years and older living in one of 30 municipalities which had a test facility at the time (n = 5) or was neighbouring a municipality with a test facility (n = 25). Approximately 45% of the population of Denmark
bAdjusted for non-participation by sex, age group and region by multiple imputation