Table 4.

Odds ratios and lower and upper bound of the 95% CI from the transmission model for testing positive (left, reference: negative test result) and for having high viral load (right, reference: positive test without high viral load) by the disease stage and SQ-PCR result of the index case; coefficients for other variables can be found in the Supplementary Table S3 (HVL, high viral load; SQ, semi-quantitative), Belgium, 29 March 2021–22 February 2022.

Variable	Level	Test positivity			Transmission of SQ-PCR results
		Odds ratio	Lower bound	Upper bound	Odds ratio	Lower bound	Upper bound
Disease stage	Asymptomatic	ref			ref
	Presymptomatic	1.35*	1.26	1.43	1.06	0.88	1.28
	Symptomatic	1.43*	1.39	1.46	1.03	0.96	1.11
	Late symptomatic	1.32*	1.19	1.47	0.89	0.65	1.24
	Unknown	1.15*	1.07	1.23	0.93	0.75	1.15
SQ-PCR	Weakly positive	ref			ref
	Moderately positive	1.62*	1.56	1.67	1.15 *	1.01	1.30
	Highly positive	2.21*	2.14	2.27	1.41 *	1.26	1.58
	Very highly positive (HVL)	2.7*	2.62	2.79	2.84 *	2.53	3.19