Fig. 1From: Risk factors associated with mortality of COVID-19 in 3125 counties of the United StatesThe geographical distribution of three classes of counties. The clustering was based on time-variant cumulative confirmed cases from March 1 to August 27, 2020. The size of circle represented the total confirmed cases on August 27, 2020. The distributions of deaths on August 27, 2020 in the three classes of counties were combinedBack to article page