Table 2.
Comparison of nucleocapsid serology results, overall and stratified by vaccination status.
| Nucleocapside Assay Results | 1:1-Matched Comparison |
Raking Weighted Comparison |
||||
|---|---|---|---|---|---|---|
| Paramedic Samples | Blood Donor Samples | Risk Difference (95% CI) | Paramedic Samples | Blood Donor Samples | Risk Difference (95% CI) | |
| Reactive nucleocapsid assay, n (%) | 84/1,627 (5.2) | 64/1,627 (3.9) | 1.2 (–0.20 to 2.7) | 86/1,713 (5) | 790/19,513 (4.1) | 0.97 (–0.10 to 2.0) |
| Vaccinated, n (%) | 56/1,340 (4.2) | 53/1,340 (4.0) | 0.22 (–1.3 to 1.7) | 57/1,421 (4) | 672/16,188 (4.2) | –0.16 (–1.2 to 0.91) |
| Unvaccinated, n (%) | 28/287 (9.8) | 11/287 (3.8) | 5.9 (1.8–10)∗ | 29/290 (10) | 116/3,303 (3.5) | 6.5 (1.8–10)∗ |
∗
Indicates a significant risk difference.