Table 4. Postoperative hearing gain

	CWUTM (n=16)	CWUTM & MO (n=18)	p-value
Preoperative AC PTA	39.2 ±14.05	42.9 ±10.35	0.327
Postoperative AC PTA	27.57± 19.45	33.4±14.52	0.280
Δ AC PTA	11.61 ±10.02	9.58 ±12.7	0.586

	CWUTM (n=22)	CWUTM & MO (n=25)	p-value
Δ AC PTA	11.02 ±12.92	18.15±12.83	0.213

Values are presented as mean and standard deviation. CWUTM : Tympanomastoidectomy, MO : Mastoid Obliteration, AC PTA : Air Conduction Prue Tone Average, Δ AC PTA : Preoperative PTA-Postoperative PTA