Impact of the First Wave of COVID-19 on the Number of General Anesthesia Cases in 34 Tertiary Hospitals in Japan: A Multicenter Retrospective Study

Figure 2

Issuance of the state of emergency by the Japanese government. The early group prefectures, in which the state of emergency was issued on April 7, 2020, are shown in shades of red. The late group prefectures, in which emergency was declared on April 16, 2020, are shown in blue. Although not included in this study, other prefectures where the state of emergency was issued early are shown in light pink, and the prefectures where the state of emergency was issued late are shown in light blue.