Table 5. A linear regression model to determine whether age, sex, infection status and Ct value, cause a change in OD ratio.

	Estimate	Std. Error	t value	Pr(>|t|)	Significance level
(Intercept)	-0.96398	0.207112	-4.654	6.18E-06	***
Estimated Age (Years)	0.007799	0.002905	2.684	0.00792	**
Sex (Male)	0.012251	0.088153	0.139	0.88963
Infection Status (Symptomatic)	0.0415	0.106939	0.388	0.69841
Ct value (Viral load)	0.041121	0.006653	6.181	3.98E-09	***

Significance codes: 0 ‘***’ 0.001 ‘**’ 0.01 ‘*’ 0.05 ‘.’ 0.1 ‘ ’ 1. Residual standard error: 0.5728 on 185 degrees of freedom. The Multiple and Adjusted R-squared 0.229 and 0.2124, respectively. F-statistic: 13.74 on 4 and 185 DF, p-value: 7.89e-10. Optical Density (OD), Cycle threshold (Ct)