Table 2.

COIs of the specificity control group.

Group	N	COI range	Median (CI)	IQR	99th percentile
HS	718	0.01–0.82	0.03 (0.02–0.03)	0.02–0.04	0.47
HCWs	262	0.01–2.30	0.03 (0.03–0.04)	0.02–0.05	1.01
Total	980	0.01–2.30	0.03 (0.03–0.03)	0.02–0.04	0.57

HS: samples from health screening. HCWs: samples from healthcare workers.