Table 2.
Participant Characteristics by Seropositive Group (n = 6510)
| Characteristics | IgG Positive (%, 95% CI) | Total, No. (%) |
|---|---|---|
| Age category | ||
| No. | 316 | 6510 |
| 18–29 y | 97 (7.4, 6.1–9) | 1304 (20.0) |
| 30–39 y | 97 (4.4, 3.6–5.3) | 2208 (33.9) |
| 40–49 y | 60 (4.4, 3.4–5.6) | 1368 (21.0) |
| 50–59 y | 47 (4.5, 3.3–6) | 1042 (16.0) |
| 60+ y | 15 (2.6, 1.4–4.2) | 588 (9.0) |
| Gender | ||
| No. | 316 | 6510 |
| Femalea | 256 (4.9, 4.4–5.6) | 5180 (79.6) |
| Male | 60 (4.5, 3.5–5.8) | 1330 (20.4) |
| Race/ethnicity | ||
| No. | 316 | 6510 |
| Asian | 29 (4.6, 3.1–6.5) | 634 (9.7) |
| Hispanic/Latino | 46 (9.6, 7.1–12.7) | 477 (7.3) |
| Non-Hispanic Black | 17 (8.5, 5–13.2) | 201 (3.1) |
| Non-Hispanic White | 212 (4.3, 3.8–5) | 4877 (74.9) |
| Other/multiracial/NA | 12 (3.7, 1.9–6.4) | 321 (4.9) |
| Obesity | ||
| No | 271 (5.0, 4.5–5.7) | 5382 (84.6) |
| Yes | 43 (4.4, 3.2–5.9) | 982 (15.4) |
| High blood pressure | ||
| No. | 312 | 6381 |
| No | 285 (5.1, 4.5–5.7) | 5581 (87.5) |
| Yes | 27 (3.4, 2.2–4.9) | 800 (12.5) |
| Diabetes | ||
| No. | 315 | 6380 |
| No | 301 (4.9, 4.3–5.4) | 6189 (97.0) |
| Yes | 14 (7.3, 4.1–12) | 191 (3.0) |
| COVID-19 patient exposure | ||
| No. | 314 | 6404 |
| No | 59 (2.8, 2.2–3.6) | 2092 (32.7) |
| Yes, I think so | 25 (3.4, 2.2–5) | 731 (11.4) |
| Unsure | 50 (4.3, 3.2–5.6) | 1162 (18.1) |
| Yes, definitely | 180 (7.4, 6.4–8.6) | 2419 (37.8) |
| Nonhospital COVID-19 exposure | ||
| No. | 314 | 6402 |
| No | 117 (3.4, 2.8–4.1) | 3436 (53.7) |
| Unsure | 70 (3.8, 3–4.8) | 1846 (28.8) |
| Yes, I think so | 38 (7.2, 5.2–9.8) | 526 (8.2) |
| Yes, definitely | 89 (15.0, 12.2–18.1) | 594 (9.3) |
| Family member tested for COVID-19 | ||
| No. | 314 | 6402 |
| No | 248 (4.0, 3.5–4.5) | 6186 (96.6) |
| Yes | 66 (30.6, 24.5–37.2) | 216 (3.4) |
| COVID-19 family test result | ||
| No. | 314 | 6402 |
| Got no test | 248 (4.0, 3.5–4.5) | 6186 (96.6) |
| Negative | 15 (12.2, 7–19.3) | 123 (1.9) |
| Positive | 51 (54.8, 44.2–65.2) | 93 (1.5) |
| Self-reporting on COVID-19 status | ||
| No. | 314 | 6385 |
| I believe I had COVID-19 because I had a compatible illness but tested negative | 18 (6.6, 4–10.2) | 273 (4.3) |
| I believe I had COVID-19 because I had a compatible illness but was not tested | 65 (10.2, 8–12.8) | 636 (10.0) |
| I do not believe I have had COVID-19 | 76 (1.4, 1.1–1.8) | 5298 (83.0) |
| I know I had COVID-19 because I tested positive | 155 (87.1, 81.2–91.6) | 178 (2.8) |
| Self-reporting recent illness | ||
| No. | 314 | 6385 |
| No | 169 (3.3, 2.8–3.8) | 5139 (80.5) |
| Yes | 145 (11.6, 9.9–13.5) | 1246 (19.5) |
Abbreviations: COVID-19, coronavirus disease 2019; IgG, immunoglobulin G; NA, not answered.
aIncludes <10 who did not self-identify.