Surgical Results of Retrograde Mastoidectomy with Primary Reconstruction of the Ear Canal and Mastoid Cavity

Table 3

Postoperative changes in degree of hearing loss ().

Degree of hearing loss^b	PTA^a before surgery				value
	Mild hearing loss; ()	Moderate hearing loss; ()	Severe hearing loss; (	Profound hearing loss; ()
PTA after surgery
Mild hearing loss ()	22	19	0	0	0.04
Moderate hearing loss ()	8	29	6	1
Severe hearing loss ()	0	1	6	1
Profound hearing loss ()	0	0	3	6

PTA: pure-tone average.
^bThe degree of hearing loss was defined by the source of Clark, (1981) [17] (i.e., mild hearing loss: ≤40 dB, moderate hearing loss: 41–70 dB, severe hearing loss: 71–90 dB, profound hearing loss: ≥91 dB).