Table 3.

Inter-rater reliability between developed ELISA system results (in nasopharyngeal swabs) and RT-qPCR according to Ct value.

Ct Value			RT-qPCR		Kappa
			P	N
Ct ≤ 30	ELISA	P	27	0	0.932 *
			21.3%	0.0%
		N	3	97
			2.4%	76.4%
Ct > 30- ≤ 35	ELISA	P	32	0	0.848 *
			24.2%	0.0%
		N	8	92
			6.1%	69.7%
Ct > 35- ≤ 40	ELISA	P	44	0	0.905 *
			30.6%	0.0%
		N	6	94
			4.2%	65.3%

Cohen’s Kappa test was used to evaluate the test agreement. * p value < 0.001. Data are represented as numbers and percentages of total.