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Sensitivities of antigen test stratified by Ct value.
| Ct value (N2) | Sensitivity (%) | p |
|---|---|---|
| <20 | 100 (91.0–100) | <0.001 |
| 20–24 | 96.7 (82.8–99.9) | |
| 25–29 | 100 (83.2–100) | |
| ≥30 | 18.8 (4.0–45.6) |
Sensitivity is provided with 95% confidence intervals.
Ct, cycle threshold.
