Table 3. PTA at Cholesteatoma and No Cholesteatoma.

	Cholesteatoma (Jahrsdoerfer score)			Average (N = 46)	No cholesteatoma (Jahrsdoerfer score)			Average (N = 57
	≤8 (N = 17)	9 (N = 12)	10 (N = 17)		≤8 (N = 19)	9 (N = 19)	10 (N = 19)
Preoperative ABG, mean ± SD, dB	34.1 ± 9.3	35.2 ± 10.4	30.9 ± 15.4	33.2 ± 12.0	37.5 ± 11.1	38.1 ± 11.0	33.4 ± 13.5	36.3 ± 11.9
Postoperative ABG, mean ± SD, dB	26.6 ± 12.2	19.5 ± 10.9	13.6 ± 7.4	20.0 ± 11.5	26.1 ± 8.0	18.3 ± 8.1	15.3 ± 9.3	19.9 ± 9.5
ΔABG(dB), mean ± SD, dB	7.5 ± 12.7	15.6 ± 15.1	17.2 ± 17.0	13.2 ± 15.3	11.3 ± 11.6	19.8 ± 13.0	18.1 ± 15.0	16.4 ± 13.5