Influence of electrode site on M level

Differences between M level groups according to electrode site were also analysed using one-way ANOVA. It showed that the M levels were significantly different depending on the position of the electrode contact on the array (p ≤ 0.001). Post hoc comparisons using Dunn’s method were significant for M levels of site group 4 versus M levels of site groups 1 and 2 (p ≤ 0.05). Pearson correlation coefficient (r) was used to determine whether a relationship existed between M level and electrode site. It showed that M levels were positively related with the electrode site (r = 0.93, p < 0.001). This relationship is illustrated by Figure 6, the slope of the line resulting from the regression analysis being 3.67 CU per mm of cochlea.

Figure 6. M levels averaged across subjects for each electrode site. * represents significant differences among groups of electrodes (p < 0.05). Vertical bars show the standard error around each mean. Regression analysis was applied on the data. The resulting equation is y = 3.67x + 112.52. It explains 86 % of the variability.
Figure 6. M levels averaged across subjects for each electrode site. * represents significant differences among groups of electrodes (p < 0.05). Vertical bars show the standard error around each mean. Regression analysis was applied on the data. The resulting equation is y = 3.67x + 112.52. It explains 86 % of the variability.