Table 1.

Bone conductance threshold measured by pure tone audiometry in cases.

Frequency (Hz)	Mean threshold		P value
	Before treatment (SD)	One month after treatment (SD)
250	9.7 (0.9)	9.6 (1.0)	0.83
500	7.5 (0.7)	8.3 (0.8)	0.103
1000	7.4 (0.9)	8.3 (1.2)	0.088
2000	6.35 (0.9)	7.8 (1.5)	0.90
4000	9.38 (1.0)	17.9 (2.6)	0.001
8000	10.7 (1.2)	17.6 (2.6)	0.001

SD: standard deviation.