TABLE 1—
Demographic Characteristics and Percentage of Antibody-Positive Participants in the Probability and Volunteer Samples for Waves 1 Through 8: Jefferson County, KY, June 2020–August 2021
| Characteristic | Probability (Waves 1–8) | Volunteer (Waves 1–8) | ||
| No. (Weighted %) | Positive Antibody (Weighted %) | No. (Weighted %) | Positive Antibody (Weighted %) | |
| Total | 7296 (100.0) | 13.2 | 7919 (100.0) | 14.1 |
| Female | 4363 (59.8) | 12.9 | 4981 (62.9) | 12.6 |
| White | 6271 (86.0) | 12.7 | 6489 (81.9) | 12.2 |
| Age, y | ||||
| 18–34 | 891 (12.2) | 14.2 | 1463 (18.5) | 11.6 |
| 35–59 | 2706 (37.1) | 12.4 | 3655 (46.2) | 12.6 |
| ≥ 60 | 3699 (50.7) | 13.4 | 2801 (35.4) | 13.5 |
| Single family home | 6293 (86.3) | 13.4 | 6813 (86.0) | 12.3 |
| Smoker | 574 (7.9) | 8.5 | 595 (7.5) | 8.3 |
| E-cigarette user | 181 (2.5) | 14.1 | 219 (2.8) | 12.5 |
| Chronic conditions | 3924 (53.8) | 13.9 | 3607 (45.5) | 13.2 |
| COVID-19 symptoms | 438 (6.0) | 17.5 | 725 (9.2) | 12.4 |