Table 2.
Displays the summary statistics of pre-COVID-19 negative specimens used to calculate optimal cut-off values for spike and nucleoprotein-directed IgG, IgM, and IgA binding antibodies.
| Variable | n | Min | Max | Median | IQR | Mean |
|---|---|---|---|---|---|---|
| spike Protein: IgG Mean OD | 205 | 0.000 | 1.146 | 0.081 | 0.045, 0.184 | 0.147 |
| spike Protein: IgM Mean OD | 206 | 0.000 | 1.406 | 0.158 | 0.077, 0.306 | 0.240 |
| spike Protein: IgA Mean OD | 206 | 0.000 | 0.737 | 0.00 | 0.00, 0.003 | 0.021 |
| nucleoprotein: IgG Mean OD | 207 | 0.000 | 1.843 | 0.236 | 0.158, 0.386 | 0.326 |
| nucleoprotein: IgM Mean OD | 207 | 0.000 | 1.107 | 0.256 | 0.154, 0.377 | 0.298 |
| nucleoprotein: IgA Mean OD | 207 | 0.000 | 1.093 | 0.093 | 0.056, 0.154 | 0.118 |
| RBD-IgG | 203 | 0.000 | 1.065 | 0.031 | 0.017, 0.067 | 0.060 |
| RBD-IgM | 203 | 0.000 | 1.374 | 0.142 | 0.086, 0.253 | 0.224 |
| RBD-IgA | 203 | 0.000 | 0.162 | 0.013 | 0.006, 0.024 | 0.017 |