Table 1. The incidence of postoperative hearing loss according to brainstem auditory evoked potentials (BAEPs) changes

Groups	The maximal change of BAEPs (wave V)	Patients, n(%)	Postoperative hearing loss, n(%)	p-value
A	No change	596 (63.9)	1 (0.1)	<0.001
B	Only latency prolongation(≥1 msec)	194 (20.8)	0
C	Only amplitude decrement(≥50%)	8 (0.9)	0
D	Latency prolongation(≥1 msec) + Amplitude decrement(≥50%)	96 (10.3)	2 (2.0)
E	Transient loss	27 (2.9)	2 (7.4)
F	Permanent loss	11 (1.2)	6 (54.5)
Total		932	11 (1.2)