Table 1 COVID-19 antibody prevalence among New York health care workers
Characteristic | Total | Negative for antibodies (IgG and IgM) | Positive for antibodies (IgG or IgM) | ||||
|---|---|---|---|---|---|---|---|
Total | 474 | 394 | 83.1% | 80 | 16.9% | (13.6%, 20.6%) | |
Sex—no. (%) | |||||||
Male | 182 | 38.4% | 156 | 85.7% | 26 | 14.3% | (9.6%, 20.2%) |
Female | 292 | 61.6% | 238 | 81.5% | 54 | 18.5% | (14.2%, 23.4%) |
Age—mean (Std) | 42.0 | 11.30 | 41.9 | 11.3 | 42.4 | 11.5 | N/A |
Race—no. (%) | |||||||
Non-Hispanic White | 339 | 71.5% | 286 | 84.4% | 53 | 15.6% | (11.9%, 20.0%) |
Hispanic or Latino | 31 | 6.5% | 24 | 77.4% | 7 | 22.6% | (9.6%, 41.1%) |
African American/Black | 14 | 3.0% | 13 | 92.9% | 1 | 7.1% | (0.2%, 33.9%) |
Asian | 87 | 18.4% | 68 | 78.2% | 19 | 21.8% | (13.7%, 32.0%) |
Others/unknown | 3 | 0.6% | 3 | 100.0% | 0 | 0.0% | N/A |
Had a PCR test—no. (%) | 65 | 13.7% | 48 | 73.8% | 17 | 26.2% | (16.0%, 38.5%) |
# Days from first PCR test to antibody test (must have occurred before the antibody test)—median, IQR | 15 | [11, 22] | 14 | [9, 20] | 17 | [13.0, 24.0] | N/A |
Symptom groups—no. (%) | |||||||
Asymptomatic since 15 February 2020 | 244 | 51.5% | 214 | 87.7% | 30 | 12.3% | (8.5%, 17.2%) |
Symptomatic, but no +PCR test prior to our AB samples | 217 | 45.8% | 178 | 82.0% | 39 | 18.0% | (13.1%, 23.7%) |
PCR+ test prior to our AB samples | 13 | 2.7% | 2 | 15.4% | 11 | 84.6% | (54.6%, 98.1%) |
# Days from symptom onset to first Ab test (n = 230) —median (IQR) | 25.5 | [17.0, 38.0] | 24 | [15.5, 39.0] | 29.5 | [21.0, 38.0] | N/A |