Health Data Science / 2021 / Article / Fig 5

Research Article

Mobile Phone-Based Population Flow Data for the COVID-19 Outbreak in Mainland China

Figure 5

Strength of correlation between population movements and number of diagnosed cases by the length of observation days. (a) All provinces in mainland China excluding Hubei; (b) all cities in mainland China excluding cities in Hubei. Outbound flows are counted for three periods: all days before January 22, January 2 to January 8 (first week), January 9 to January 15 (second week), and January 16 to January 22 (third week).