Table 3.

Accuracy measures of the BS strip assay categorized according to Ct values.

		Sensitivity (%)	Specificity (%)	PPV (%)	NPV (%)	Diagnostic efficacy (%)	Kappa
In saliva	Overall Ct	95.21	99.29	99.42	93.29	96.56	0.931
	at Ct $\le$ 30	98.54	99.29	98.55	98.58	98.57	0.968
	at Ct $\le$ 35	95.38	99.29	98.41	97.89	98.05	0.955
	at Ct $\le$ 40	88.89	99.29	97.56	96.53	96.76	0.909
In nasopharyngeal	Overall Ct	91.11	98.57	98.80	89.61	94.38	0.887
	at Ct $\le$ 30	94.29	98.57	97.06	97.18	97.14	0.935
	at Ct $\le$ 35	92.31	98.57	96.77	96.50	96.59	0.92
	at Ct $\le$ 40	84.44	98.57	95.00	95.17	95.14	0.863