Change in auditory threshold and loudness perception between before and three months after auditory rehabilitation.

To determine whether or not auditory thresholds were modified in the three months between the first and the second test, a 2-way repeated measures ANOVA (on frequency and rehabilitation time-course) was performed. A significant effect was found for frequency (F(9,36)=8.738, p<0.001), with higher auditory thresholds at higher frequencies, whereas no overall effect was found for rehabilitation time-course (F(1,36)=1.504, p=0.287). The interaction between the two factors was not significant (F(9,36)=0.710, p=0.696).

The same statistical analysis was performed on the loudness-matching results. Once again there was a significant effect for frequency (F(9,36)=3.662, p=0.002): a lower intensity was necessary for high frequency tones to be perceived as being as loud as the reference frequency. No effect of rehabilitation time-course (F(1,36)=1.939, p=0.236) or interaction between the two factors (F(9,36)=0.906, p=0.531) were found.