Statistics analysis
Prism version 8 was used. Statistical methods: 1) Bland-Altman analysis was used to measure the agreement between fs-ABR and PTA results. This method is more accurate in comparing the agreement between clinical measurements(11). 2) Linear regression analysis was used to find out the correlation between post-surgery PTA and intra-fs-ABR, PTAI and fs-ABRI results. 3) Paired and unpaired Student’s t-tests were used and values of p less than 0.05 was considered as statistically different.