Fig. 1

Incidence of HFMD for 31 provinces in China from May 2008 to December 2012. a Incidence of 31 provinces. Provinces from left to right were ranked by climate zone that the province is in and the latitude of province captical if provinces were in the same climate zone. b Scatter plot of average incidence and population density. Since many studies associate incidence with climate and population density, it is reasonable to include climate zone information and population density into the exhibit of incidence. c Provinces colored according to which climate zones they belong to. The country were divided into northwest and southeast regions