Table 2. Postoperative finding of tympanic membrane

	CWUTM (n=25)	CWUTM & MO (n=44)	p-value
Perforation of tympanic membrane	5 (20%)	12 (27.2%)	0.356
Otorrhea	4 (16%)	2 (4%)	0.180
Retraction of tympanic membrane	0 (0%)	0 (0%)	-

CWUTM : Canal Wall Up Tympanomastoidectomy, MO : Mastoid Obliteration