Table 2.
Clinical performance analysis of InstaView COVID-19 Antigen Home Test according to Ct values and days of symptom onset.
| Ct Values | InstaView COVID-19 Antigen Home Test |
Sensitivity (%) (95% CI) |
|
|---|---|---|---|
| Positive | Negative | ||
| Overall | 85 | 6 | 93.4 (86.2–97.5) |
| RT-PCR Ct values | |||
| Ct ≤ 20 | 17 | 0 | 100 (80.5–100) |
| 20 < Ct ≤ 25 | 39 | 2 | 95.1 (83.5–99.4) |
| 25 < Ct ≤ 30 | 23 | 2 | 92.0 (74.0–99.0) |
| 30 < Ct | 6 | 2 | 75.0 (34.9–96.8) |
| Days after symptom onset | |||
| 1–2 | 44 | 3 | 93.6 (82.5–98.7) |
| 3–5 | 41 | 3 | 93.2 (81.3–98.6) |
Abbreviations: Ct, cycle threshold; CI, confidence interval.