Table 1.

Antigen test results stratified by different Ct value cut-offs

	Antigen test negative	Antigen test positive	Total
	n (% within Ct value)	n (% within Ct value)	n (% within total)
Ct value > 25	18 (48.6%)	19 [51.4% (95% CI 34.4–68.1)]	37 (72.5%)
Ct value ≤ 25	2 (14.3%)	12 [85.7% (95% CI 57.2–98.2)]	14 (27.5%)
Ct value > 30	14 (63.6%)	8 [36.4% (95% CI 17.2–59.3)]	22 (43.1%)
Ct value ≤ 30	6 (20.7%)	23 [79.3% (95% CI 60.3–92.0)]	29 (56.9%)
Ct value > 33	5 (83.3%)	1 [16.7% (95% CI 0.42–64.1)]	6 (11.8%)
Ct value ≤ 33	15 (33.3%)	30 [66.7% (95% CI 51.1–80.0)]	45 (88.2%)
Total	20 (39.2%)	31 [60.8% (95% CI 46.1–74.2)]	51 (100%)