Distribution of ABO blood groups among individuals tested and not tested for SARS-CoV-2 in Denmark
| Blood group . | SARS-CoV-2 tested, n (%) . | Reference population, n (%) . | P, SARS-CoV-2+ vs reference population . | RR (95% CI), positive individuals vs reference population . | |
|---|---|---|---|---|---|
| Positive . | Negative . | ||||
| O | 2851 (38.41) | 193 401 (41.48) | 919 303 (41.69) | <.001 | 0.87 (0.82-0.91) |
| A | 3296 (44.41) | 199 211 (42.73) | 934 421 (42.39) | <.001 | 1.09 (1.02-1.13) |
| B | 897 (12.09) | 52 838 (11.33) | 252 559 (11.46) | .091 | 1.06 (1.03-1.19) |
| AB | 378 (5.09) | 20 782 (4.46) | 98 459 (4.47) | .011 | 1.15 (1.05-1.31) |
| Total, n | 7422 | 466 232 | 2 204 742 | ||
| Blood group . | SARS-CoV-2 tested, n (%) . | Reference population, n (%) . | P, SARS-CoV-2+ vs reference population . | RR (95% CI), positive individuals vs reference population . | |
|---|---|---|---|---|---|
| Positive . | Negative . | ||||
| O | 2851 (38.41) | 193 401 (41.48) | 919 303 (41.69) | <.001 | 0.87 (0.82-0.91) |
| A | 3296 (44.41) | 199 211 (42.73) | 934 421 (42.39) | <.001 | 1.09 (1.02-1.13) |
| B | 897 (12.09) | 52 838 (11.33) | 252 559 (11.46) | .091 | 1.06 (1.03-1.19) |
| AB | 378 (5.09) | 20 782 (4.46) | 98 459 (4.47) | .011 | 1.15 (1.05-1.31) |
| Total, n | 7422 | 466 232 | 2 204 742 | ||