Fig. 4
Correlation between SFTS annual incidence rates and each environmental factor. SFTS, severe fever with thrombocytopenia syndrome. Spearman’s rank correlation coefficient analysis was performed for the statistical analysis. *Factors with a significant correlation with SFTS incidence rate. Y-axis: average SFTS annual incidence per 100,000 people (mean rates for the 5-year period) between 2018 and 2022. (a) X-axis: Average temperature (°C) in each prefecture between 2018 and 2022. (b) X-axis: Maximum temperature (°C) in each prefecture between 2018 and 2022. (c) X-axis: Minimum temperature (°C) in each prefecture between 2018 and 2022. (d) Forest area. X-axis: Square measure (ha) of forest area in each prefecture in 2019. (e) Field area. X-axis: Square measure (m2) of field area in each prefecture in 2021. (f) Agricultural population rate. X-axis: Agricultural population rata (agricultural population/total population in each prefecture) in 2020. (g) X-axis: Daylight hours (hr) between in each prefecture 2018 and 2022. This figure was created using Microsoft Excel and includes map data from Bing (GeoNames, Microsoft, Zenrin).
