Table 2.
Comparison of AUC's cut-offs indicated by ROC analyses among subject groups: total subjects, subjects with PCR confirmed within ten days from symptom onset, subjects with PCR confirmed within five days from symptom onset and subjects with more than one PCR tests. AUC's by IgG (N) or IgG (RBD) were shown side-by-side in each group.
| Subject number |
IgG (N) |
IgG (RBD) |
||||
|---|---|---|---|---|---|---|
| Presumed COVID-19 (−) | Presumed COVID-19 (+) | AUC | Cut-off (S/C) | AUC | Cut-off (AU/mL) | |
| Total subject | 10 | 14 | 0.982 | 0.20 | 0.854 | 7.2 |
| PCR confirmed within 10 days from onset | 8 | 12 | 0.990 | 0.20 | 0.849 | 11.3 |
| PCR confirmed within 5 days from onset | 5 | 6 | 0.967 | 0.20 | 0.800 | 2.9 |
| Subjects with repeated PCR tests | 7 | 8 | 0.982 | 0.26 | 0.813 | 262.9 |
AUC: area under the curve.