Table 1.
Two 2 × 2 contingency tables in which the performance of the rapid antigen test is compared with that of a reverse transcription polymerase chain reaction-based test. In the upper 2 × 2 table, only the cohort of symptomatic patients is reported. In the lower 2 × 2 table, the asymptomatic patients are reported.
| Only considering symptomatic patients for COVID-19 | |||
|---|---|---|---|
| Negative antigen test for COVID-19 | Positive antigen test for COVID-19 | ||
| Patients COVID-19 non-infected | 802 | 20 | |
| Patients COVID-19 infected | 17 | 152 | |
| Sensitivity | 89.94% (85.4–94.4) | ||
| Specificity | 97.57% (96.5–98.5) | ||
| Positive predictive value | 85.37% (90.5–80.0) | ||
| Negative predictive value | 97.92% (96.9–98.8) | ||
| Accuracy (correctly classified) | 96.27% (95.0–97.3) | ||
| Only considering asymptomatic patients for COVID-19 | |||
| Negative antigen test for COVID-19 | Positive antigen test for COVID-19 | ||
| Patients COVID-19 non-infected | 2355 | 10 | |
| Patients COVID-19 infected | 27 | 27 | |
| Sensitivity | 50.00% (36.0–63.0) | ||
| Specificity | 99.58% (99.1–99.9) | ||
| Positive predictive value | 72.97% (58.6–87.2) | ||
| Negative predictive value | 98.87% (98.3–99.2) | ||
| Accuracy (correctly classified) | 98.47% (97.9–98.9) | ||