Table 2.

Accuracy measures of the Nbs-based versus mAbs-based LFT using RT-PCR as a reference test.

			LFT strip (−)/PCR (−)	LFT strip (+)/PCR (+)	Sensitivity (%)	Specificity (%)	PPV (%)	NPV (%)	Accuracy (%)	kappa	Kappa SE	P-value
In saliva	Overall Ct	Nbs	138/140	165/180	91.66	98.57	98.78	88.46	94.75	0.875	0.027	0.000
		mAbs	137/140	150/180	83.33	97.86	98.01	81.07	89.06	0.783	0.034	0.000
	At Ct $\le$ 30	Nbs	138/140	68/70	97.14	98.57	97.01	96.50	96.67	0.924	0.028	0.000
		mAbs	137/140	63/70	90.04	97.86	95.31	93.84	94.29	0.869	0.037	0.000
	At Ct $\le$ 35	Nbs	138/140	60/65	92.31	98.57	96.77	96.50	96.59	0.92	0.03	0.000
		mAbs	137/140	55/65	84.62	97.86	94.83	93.20	93.66	0.849	0.04	0.000
	At Ct $\le$ 40	Nbs	138/140	37/45	82.22	98.57	94.87	94.52	94.59	0.846	0.047	0.000
		mAbs	137/140	32/45	71.11	97.86	91.43	91.3	91.35	0.746	0.06	0.000

Positive cases about Cycle threshold (Ct).