Statistical analysis:

The comparisons between the time course of the auditory rehabilitation (before, and 1 month, 3 months and 6 months after) and between the various frequencies tested were made by 2-way repeated-measures ANOVA, the dependent variable being either the auditory threshold, or the loudness or the frequency discrimination score. Results were regarded as statistically significant when p < 0.05. Post-hoc comparisons were made by Bonferroni test.