Table 3.

Parameters and assumptions in the effectiveness model.

Parameter	Value/distribution	Source
Growth rate (r)	0.030 per day	Study population in autumn 2020 (see Suppl. File A)
Incubation time	Weibull (shape = 2.435, scale = 6.258)	13
Generation time	Suppl. Fig. 4 (Suppl. File B)	Approximated by the estimated serial interval
Coverage of isolation${}^{\mathrm{a}}$ (${ϵ}_I$)	80$\%$/50$\%$	Good/poor adherence to testing (see Suppl. File C)
Mean delay until isolation (${\mathrm{\Delta }}_I$) since symptoms	2.6 days	This study (Table 1)
Coverage of quarantine${}^{\mathrm{b}}$ (${ϵ}_T$)	33$\%$	Assumption
Mean delay until quarantine (${\mathrm{\Delta }}_T$) since infection	5 days	This study
Proportion of asymptomatic infections ($P_{\alpha }$)	30$\%$/50$\%$	30$\%$ = prop. of cases with unknown source (this study); 50$\%$15
Relative infectiousness of asymptotically infected ($x_{\alpha }$)	50$\%$/100$\%$	Assumption7

The table summarises the parameters used to evaluate the counterfactual effective reproduction number in the absence of case isolation and contact tracing. The parameter symbols refer to those as used in Supplementary File C.

${}^{\mathrm{a}}$Proportion of symptomatic SARS-CoV-2 cases that are tested and isolated.

${}^{\mathrm{b}}$Proportion of secondary cases set to quarantine before symptom onset due to contact tracing.