Ecological Study on Differences in COVID-19 Fatality among Wuhan, Rest of Hubei, and Rest of China.

Background: China's vigorous anti-COVID-19 campaign has been going on for three months since January 20, which has contained the spread of the virus across China.

Objectives: Epidemiological investigations found that COVID-19 fatality rates in Wuhan, rest parts of Hubei province except Wuhan (Rest of Hubei) and rest parts of Mainland China except Hubei province (Rest of China) were different. An ecological study was conducted to analyze the reasons and provide the world with China's anti-COVID-19 epidemic experiences.