Table 2.

Relative sensitivity for subcategories.

Positive RT-PCR	Relative sensitivity (%)
Ct ≤ 20; N = 46	100 (95% CI 92.12–100)
20 < Ct < 25; N = 18	100 (95%CI 92.13–100)
25 < Ct>< 30; N = 30	46.67 (95% CI 28.34–65.67)
30 < Ct < 35; N = 29	3.44 (95% CI 0.08–17.76)