Effect of Preoperative Mastoid Ventilation on Tympanoplasty Success

Table 3

Preoperative and postoperative hearing threshold averages and air-bone gaps measured in all the patients and the mastoid ventilation groups.

	Preoperative			1st month			3rd month			12th month
	ac	bc	abg	ac	bc	abg	ac	bc	abg	ac	bc	abg
	(dB)	(dB)	(dB)	(db)	(dB)	(dB)	(dB)	(dB)	(dB)	(dB)	(dB)	(dB)
Patients	48	22	26	36.3	15.6	20.6	32.3	15.9	16.4	30.8	15.3	15.5
Group I	39.71	16.85	22.86	34.4	13	21.4	26.1	13	13.1	22.9	11.9	11
Group II	45.14	24.35	20.79	35.3	18.3	17	31.1	17.1	13.9	31.1	17.6	13.4
Group III	46.69	21.86	24.83	37.2	17.6	19.5	34.2	18.1	16.1	32.8	17.6	17.6

ac: air way conduction; bc: bone conduction; abg: air bone gap.