Table 1.
Characteristics of the blood donors and the background population aged 17–72 years.
| Blood Donors |
Background population | ||
|---|---|---|---|
| Characteristics | November | In 2022 Study Period | |
| Number of participants (N) | 8 701 | 29 887 | 4 098 183 |
| Number of samples tested (N) | 8 701 | 34 389 | - |
| N (%) | N (%) | N (%) | |
| Vaccination statusa | |||
| Not vaccinated | - | 756 (2·5) | 436 728 (10·6) |
| 1st dose | - | 154 (0·5) | 70 916 (1·7) |
| 2nd dose | - | 9 558 (32·0) | 1 487 471 (36·2) |
| 3rd dose | - | 19 413 (65·0) | 2 111 485 (51·4) |
| Comorbidity status | |||
| Known comorbidity | - | 2 000 (6·7) | 640 022 (15·6) |
| No known comorbidity | - | 27 465 (91·9) | 3 297 558 (80·4) |
| Information not available | - | 422 (1·4) | 160 603 (3·9) |
| Gender | |||
| Women | 3 889 (44·7) | 14 471 (48·4) | 2 038 166 (49·7) |
| Men | 4 812 (55·3) | 15 416 (51·6) | 2 060 017 (50·3) |
| Ageb | |||
| 17–35 years | 2 767 (31·8) | 10 536 (35·3) | 1 437 005 (35·1) |
| 36–50 years | 2 719 (31·2) | 9 315 (31·2) | 1 080 460 (26·4) |
| 51–60 years | 2 094 (24·1) | 6 688 (22·4) | 799 448 (19·5) |
| 61–72 years | 1 121 (12·9) | 3 348 (11·2) | 781 270 (19·1) |
| Administrative region | |||
| Capital Region of Denmark | 1 795 (20·6) | 7 691 (25·7) | 1 330 114 (32·5) |
| Region Zealand | 1 546 (17·8) | 4 161 (13·9) | 576 633 (14·1) |
| Region of Southern Denmark | 2 686 (30·9) | 6 713 (22·5) | 845 114 (20·6) |
| Central Denmark Region | 1 532 (17·6) | 7 505 (25·1) | 936 228 (22·8) |
| North Denmark Region | 1 142 (13·1) | 3 817 (12·8) | 410 094 (10·0) |
| Number of SARS-CoV-2 RT-PCR tests from Nov 1, 2021 to January 1, 2022 | |||
| 0 | - | 2 991 (10·0) | 692 619 (16·9) |
| 1–2 | - | 7 872 (26·3) | 1 330 855 (32·5) |
| 3–5 | - | 8 812 (29·5) | 1 102 572 (26·9) |
| 6–9 | - | 5 764 (19·3) | 570 014 (13·9) |
| 10–14 | - | 2 747 (9·2) | 244 331 (6·0) |
| 15+ | - | 1 701 (5·7) | 157 792 (3·9) |
| At least one positive SARS-CoV-2 RT-PCR test before Nov 1, 2021 | - | 2 130 (7·1) | 300 858 (7·3) |
| At least one positive SARS-CoV-2 RT-PCR test between Nov 1, 2021 and January 1, 2022 | - | 2 933 (9·8) | 326 630 (8·0) |
a
Vaccination status was ascertained January 1, 2022 for the blood donors and January 4, 2022 for the general population.
b
The age of blood donors was determined at the date of donation and the age of the background population was determined at January 1, 2022.