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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