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Table 1 COVID-19 antibody prevalence among New York health care workers

From: Prevalence of IgM and IgG antibodies to SARS-CoV-2 in health care workers at a tertiary care New York hospital during the Spring COVID-19 surge

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
  1. Binomial exact 95% confidence intervals for proportions of positive antibodies are located in the right-most column of the table. Percentages for the total health care workers are presented as a proportion of the total (column), whereas percentages for the antibody groups are presented as proportions of the subgroup (row) Std standard deviation, PCR Polymerase chain reaction, IQR Interquartile range, Ab test Chembio COVID-19 antibody test