Frequency (kHz) | 0.25 | 0.5 | 1 | 2 | 4 | Average threshold |
Preoperative | 11.6 ± 6.7 | 16.7 ± 8.1 | 15.9 ± 10.1 | 23.1 ± 11.6 | 22.6 ± 12.1 | 16.8 ± 8.0 |
Postoperative | 11.7 ± 7.1 | 16.0 ± 7.4* | 15.2 ± 9.6* | 21.0 ± 10.3** | 21.9 ± 11.4* | 16.0 ± 7.8** |
t value | 0.44 | 2.11 | 2.11 | 3.04 | 2.11 | 3.18 |
P value | 0.66 | 0.04 | 0.04 | 0.005 | 0.04 | 0.004 |