Fig. 2From: Spatial association between green space and COPD mortality: a township-level ecological study in Chongqing, ChinaBivariate correlation matrix graph. Deaths is the mortality rate between 2012 and 2020 for each communal administrative unit; FVC is the fractional vegetation cover; Hospital is the nuclear density value of medical institutions in each region; Age is the percentage of population over 65Â years old in each region; Female is the percentage of female population in each region. Red cells indicate a positive correlation, Blue cells a negative correlationBack to article page