Table 2.

ABR threshold and results of PTA according to the stage of congenital cholesteatoma

Stage	ABR threshold	PTA
I	21.0±1.6 dB	BC: 2.8±0.5 dB, AC: 8.0±6.2 dB
II	30.0 dB	BC: 2.0±0.7 dB, AC: 33.5±14.5 dB
III	30.0 dB	BC: 5.5±3.8 dB, AC: 34.8±8.9 dB
IV	N/A	BC: 22.4±12.1 dB, AC: 60.3±12.4 dB

ABR: auditory brainstem response; PTA: pure tone audiometry; N/A: not available; BC: bone conduction; AC: air conduction

ABR data were not available for stage 4 patients.