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Table 4 Estimates of R0 during the early phase of the epidemic

From: Saving lives during the COVID-19 pandemic: the benefits of the first Swiss lockdown

Region Starting date Breakpoint date R0 β
Lake Geneva 6 March 23 March 2.2939 0.3955
Espace Mittelland 6 March 26 March 1.9005 0.3277
Northwestern Switzerland 5 March 25 March 1.9528 0.3367
Zurich 8 March 24 March 2.1808 0.3760
Eastern Switzerland 7 March 24 March 2.0553 0.3544
Central Switzerland 5 March 25 March 1.8601 0.3207
Ticino 3 March 22 March 2.1577 0.3720
Switzerland 5 March 24 March 2.0859 0.3596
  1. Note: This table reports the estimated length of the early phase of the epidemic—characterized by an exponential growth of cases—and the corresponding basic reproduction number R0 in the main Swiss regions. The starting date is conventionally fixed when an incidence of at least 20 cases per 100,000 individuals is reached. The breakpoint date corresponds to a change in the growth rate of the cumulative number of cases due to containment measures (see Fig. 1). The value of β is retrieved by multiplying R0 and γ