Table 3. Postoperative finding of tympanic membrane, according to the status of mastoid cavity

	Diploic mastoid cavity (n=30)			Sclerotic mastoid cavity (n=39)
	CWUTM (n=12)	CWUTM & MO (n=18)	p-value	CWUTM (n=13)	CWUTM & MO (n=26)	p-value
Perforation of tympanic membrane	3 (25.0%)	6 (33.3%)	0.472	2 (15.3%)	6 (23.1%)	0.456
Otorrhea	3 (25%)	1 (5.6%)	0.163	1 (7.6%)	1 (3.8%)	0.561
Retraction of tympanic membrane	0 (0%)	0 (0%)	-	0 (0%)	0 (0%)	-

CWUTM : Canal Wall Up Tympanomastoidectomy, MO : Mastoid Obliteration