Table 1.

Amplitudes of wave I in click of the 5 groups from hearing threshold to 90 dB SPL

SPL (dB)	Control group		0 day group		4 days group		7 days group		14 days group
	A of wave IP	Mean of IP	A of wave IP	Mean of IP	A of wave IP	Mean of IP	A of wave IP	Mean of IP	A of wave IP	Mean of IP
20	0.92 ± 0.3	1.78							0.67 ± 0.18	1.79
25	1.06 ± 0.28	1.74							0.93 ± 0.12	1.75
30	1.42 ± 0.21	1.71							1.26 ± 0.41	1.72
35	2.02 ± 0.17	1.68	0.63 ± 0.23	1.76			0.98 ± 0.11	1.72	1.75 ± 0.51	1.68
40	2.97 ± 0.66	1.65	0.88 ± 0.58	1.72			1.02 ± 0.47	1.70	2.36 ± 0.61	1.65
45	3.76 ± 0.48	1.62	1.10 ± 0.33	1.69	0.46 ± 0.08	1.67	1.86 ± 0.64	1.67	3.41 ± 0.72	1.62
50	4.51 ± 0.62	1.60	1.65 ± 0.74	1.66	0.64 ± 0.52	1.63	2.71 ± 1.71	1.62	3.82 ± 0.63	1.59
55	4.86 ± 1.02	1.55	1.92 ± 0.39	1.63	1.01 ± 0.35	1.59	3.22 ± 1.63	1.58	4.51 ± 0.68	1.56
60	5.24 ± 1.73	1.52	2.24 ± 0.74	1.60	1.32 ± 0.13	1.56	3.46 ± 1.21	1.55	4.69 ± 0.75	1.52
65	5.57 ± 1.08	1.47	2.86 ± 0.89	1.57	1.5 ± 0.69	1.52	4.01 ± 0.94	1.50	5.16 ± 1.82	1.49
70	5.90 ± 1.26	1.43	3.01 ± 1.18	1.54	1.68 ± 0.51	1.50	4.17 ± 1.17	1.46	5.45 ± 0.66	1.47
75	6.22 ± 0.97	1.40	3.17 ± 0.86	1.49	1.96 ± 0.43	1.48	4.51 ± 0.35	1.44	5.95 ± 1.37	1.45
80	6.48 ± 1.76	1.38	3.46 ± 1.24	1.44	2.03 ± 0.45	1.45	4.67 ± 0.47	1.41	6.03 ± 0.71	1.42
85	6.53 ± 1.16	1.34	3.72 ± 0.65	1.40	2.26 ± 0.73	1.42	4.91 ± 1.42	1.38	6.29 ± 1.51	1.38
90	6.87 ± 1.36	1.32	4.16 ± 1.38	1.36	2.68 ± 0.82	1.39	5.06 ± 1.20	1.35	6.42 ± 2.17	1.35
Sig			**		**		*		*

A stands for amplitude (μV), I_p stands for the latency of wave I (ms). Sig stands for significant difference in amplitudes of wave I was observed among the 5 groups;

^*p < 0.05;

^**p < 0.01.