Table 3. Comparison of hearing gains by frequency and ABG between two groups pre- and post-operatively

	Overall (n=388) (mean±SD)	ET (n=199) mean±SD)	MT (n=189) (mean±SD)	p-value
AC 250 Hz gain	16.31 ± 13.48	16.32 ± 13.18	16.28 ± 14.65	0.987
AC 500 Hz gain	10.69 ± 13.18	10.47 ± 13.23	11.49 ± 13.10	0.638
AC 1,000 Hz gain	6.67 ± 11.80	6.46 ± 11.31	7.45 ± 13.55	0.650
AC 2,000 Hz gain	7.00 ± 9.51	7.11 ± 8.93	6.60 ± 11.47	0.779
AC 4,000 Hz gain	4.24 ± 10.91	4.15 ± 11.17	4.57 ± 10.04	0.804
AC 8,000 Hz gain	0.18 ± 12.64	0.32 ± 12.69	-0.32 ± 12.61	0.759
Pre-operative AC	42.44 ± 19.35	41.55 ± 17.21	43.39 ± 21.37	0.352
Post-operative AC	36.42 ± 20.80	34.85 ± 17.82	42.15 ± 28.70	0.103
AC gain	7.05 ± 9.39	6.96 ± 9.04	7.36 ± 10.66	0.815
Pre-operative ABG	17.17 ± 7.89	15.96 ± 7.42	18.45 ± 8.18	0.002
Post-operative ABG	11.56 ± 8.40	10.69 ± 7.51	14.66 ± 10.54	0.019
ABG gain	6.04 ± 8.75	5.79 ± 8.93	6.90 ± 8.11	0.423