Implantation Location
After the Bartlett Test showed that the LVEF pre-procedure and LVEF at follow-up had roughly equal variance with a P-value of 0.0457, the Two-Way ANOVA showed an elevated P-value of 0.993 (greater than the significance level of 0.05), which means that there is no significant difference between the pre-implantation and the post-implantation LVEF means of the 3 locations or an interaction between the location and the pre/post-implantation LVEFs.
This leads us to another important finding. The group means for LVEF pre/post-implantation were exactly equal in the mid and high septum locations (Table 4 and Figure 2). This was not an error in our statistical analysis because the standard deviations for these two groups were different.