TABLE 3.

Sensitivity of saliva and MTS and relative odds of detection and ratio of viral RNA copy numbers of SARS-CoV-2 in saliva by day since symptom onset among 13 mildly symptomatic contacts of known cases

Days since symptom onseta	Saliva positive/N (Sensitivity %)	MTS positive/N (Sensitivity %)	Odds ratiob saliva: MTS	Estimatesc saliva: MTS
All samplesd	31/40 (78)	28/40 (70)	1.5 (0.54, 4)	0.083 (0.069, 0.099)
−3 through 2	10/11 (91)	5/11 (45)	12 (1.2, 130)	3.2 (2.8, 3.8)
3 through 8	16/18 (89)	17/18 (94)	0.47 (0.037, 6)	0.03 (0.026, 0.036)
9 through 24	5/11 (45)	6/11 (55)	0.7 (0.13, 3.8)	0.065 (0.057, 0.073)

^aDays since symptom onset inclusive of the start and end day.

^bOdds ratios and their 95% confidence intervals were estimated using logistic regression.

^cEffect estimates and their 95% confidence intervals are shown as the ratio of RNA copy numbers of saliva to MTS. Analyses were controlled for random effects of subjects and sample nested within the subjects and for censoring by the limit of detection using a linear mixed-effects model for censored responses (R Project lmec package).

^dAll samples from the 13 mildly symptomatic contacts of known cases with days since symptom onset from day −3 through day 24.