We limited our analysis to seven spatial environmental factors collected from NSTATE, LLC (http://www.netstate.com). We used regression analysis to detect and evaluate the statistical significance between the mortality rates and the spatial environmental factors.

There exist an inverse relationship between the death rates and mean elevation (T = -6.25; p = 0.000) and positive relationship with the average temperature (T = 3.07; p = 0.004). The high F-value 21.71 and low p-value indicate there is a statistically significant difference between mortality rates and the selected spatial environmental factors. The differences are certified as statistically significant and are probably not due to sampling variability only.