Table 1. Investigating the relation between the date of ‘lockdown’ and the date when the estimated $R_e$ based on case reports dropped below 1.

Based on news reports, we report when a country implemented stay-at-home orders (a ‘lockdown’). The column ‘${\displaystyle {\hat{R}}_e<1}$’ indicates when the $R_e$ point estimate first dropped below 1. The column ‘CI includes 1’ details the corresponding time interval where the 95% confidence interval included 1. Of the investigated countries that implemented a nationwide lockdown, four (Denmark, Germany, the Netherlands, Slovenia) had 95% confidence intervals that included 1 or were below before a nationwide lockdown was implemented. The column ‘Time until ${\displaystyle {\hat{R}}_e<1}$’ indicates the number of days between the lockdown and the date that the $R_e$ point estimate dropped below 1.

Country	Lockdown	Re <1	CI includes 1	Time until Re <1
Austria	16–30	20–30	[20-03, 20-03]	4 days
Belgium	18–30	30–30	[25-03, 03-04]	12 days
Denmark	18–30	≤10–03	[≤10–03, 20–06]	–8 days
Finland	16–30	01-Feb	[29-03, 30-04]	17 days
France	17–30	27–30	[23-03, 07-04]	10 days
Germany	22–30	18–30	[17-03, 19-03]	–4 days
Ireland	27–30	01–100	[04–04, 15–04]	12 days
Italy	01–300	18–30	[17-03, 19-03]	8 days
Netherlands	23–30	01-Jan	[22-03, 10-04]	13 days
Norway	14–30	21–30	[17-03, 19-03]	7 days
Poland	25–30	01-Jan	[31-03, 17-04]	8 days
Portugal	16–30	28–30	[23-03, 15-04]	12 days
Romania	24–30	01-Jun	[31-03, 29-04]	13 days
Russian Federation	30–30	01-Apr	[01–05, 08–05]	35 days
Slovenia	20–30	23–30	[≤13–03, 26–03]	3 days
Spain	14–30	26–30	[25-03, 26-03]	12 days
Sweden		01-Jan	[06–03,≥03-05-2021]
Switzerland	17–30	22–30	[20-03, 22-03]	5 days
Turkey	21–30	01-Aug	[01–04, 13–04]	18 days
United Kingdom	24–30	30–30	[28-03, 20-04]	6 days