Figure 1
(a) Effective reproduction number of all infections and severe cases in the Tokyo metropolitan area. The SoEs and beginnings of years are also shown. The first case of the Delta variant in Japan is represented as ‘Delta’. Severe cases are plotted, taking into account the 12-day delay. The light-colored range is estimated as follows. The centre of the range is the 31-day moving average of the original time series, and the range width is the 31-day moving average of the absolute difference between the centre and original time series. Before 30 Mar. 2020, the effective reproduction number is estimated using an average of 40 days because the confirmation of infection is not considered comprehensive. (b) Time series of mean duration per day of each activity in the Tokyo metropolitan area. The 7-day moving average is taken. The 1st–4th SoEs are also shown. The Pearson’s correlation among the mean duration of the four activities in the span \(200 \le t < 500\) is calculated.
