Table 3. Median Ct values of nasal and saliva specimens stratified by days from symptom onset, and results from the Wilcoxon signed-rank tests for the overall analysis cohort.

	n (Pairs)	Nasal VTM		Saliva Direct		Wilcoxon signed-rank test
Days since symptom onset		Median	IQR	Median	IQR	Median of differences	Z	p-value
		Ct		Ct
Less than 5 days	21	34.6	32.3–50.0	32.5	26.6–33.9	8.7	3.02	0.003
5 to 9 days	63	40.0	33.75–50.0	35.8	30.9–38.7	4.0	4.58	< 0.001
10 to 14 days	35	50.0	39.75–50.0	39.4	32.85–41.5	8.6	2.37	0.003
15 or more days	28	50.0	41.88–50.0	38.7	30.82–50.0	6.1	3.14	0.002