Table 1: Bone conductance threshold measured by pure tone audiometry in cases.

Frequency (Hz)Mean threshold value
Before treatment (SD)One month after treatment (SD)

2509.7 (0.9)9.6 (1.0)0.83
5007.5 (0.7)8.3 (0.8)0.103
10007.4 (0.9)8.3 (1.2)0.088
20006.35 (0.9)7.8 (1.5)0.90
40009.38 (1.0)17.9 (2.6)0.001
800010.7 (1.2)17.6 (2.6)0.001

SD: standard deviation.