COVID-19 mortality in different areas of Chinese mainland as of March 10, 2022

Background We have reported the difference of COVID-19 morbidity in different areas of Chinese mainland. Objective This paper aims to discover COVID-19 mortality difference among different areas and epidemic phases of Chinese mainland, and discuss the timing of the termination of strict quarantine measures. Methods Chinese mainland was divided into area I-III, the epidemic process was divided into phase I-IV. Daily COVID-19 death, cumulative death, death ratio, and daily severe case data were collected. Results Before April 15, 2020, during each epidemic phases, area I had the highest daily death and death ratio, while area III had the lowest. In phases III, the daily deaths in area I-III were higher than in phase II, and the death ratios in area II and III were higher than in phase II. After April 14, 2020, only two deaths in Chinese mainland occurred in area III; And severe case ratio dropped to almost all below 10%, especially after May 29, 2020, the ratio dropped to 0-4.76%. Conclusion Before mid-April 2020, the most serious COVID-19 death period in Chinese mainland is Phase III; And the most serious COVID-19 death area is Wuhan, with a mortality rate of about 0.0769 during outbreak phase. Due to adequate treatment, severe case ratio and death ratio dropped quickly, with almost zero of COVID-19 death ratio after mid-April 2020. At this time or after May 29, relaxed quarantine measure may be feasible. The intensification of SARS-CoV-2 contagiousness has led to ‘dynamic zeroing’ policy failure.