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Table 1 Preoperative and postoperative ABG in 10 dB interval

From: Retrograde mastoidectomy with canal wall reconstruction with bone graft in acquired cholesteatoma

PTA ABGInterposition technique (32 ears)TORP (18 ears)
Number (%)Number (%)
 PreoperativePostoperativePreoperativePostoperative
0–10 dB01 (03.10)00
11–20 dB1 (03.10)17 (53.12)07 (38.88)
21–30 dB18 (56.25)11 (34.37)10 (55.55)7 (38.88)
> 30 dB13 (40.62)3 (9.37)8 (44.44)4 (22.22)