Table 1. Mean and Standard Deviation of Latency Time Wave V in Milliseconds (ABR Test), Before and One Hour After Exposure in Experimental Groups.

Frequency, kHz	Latency Time Wave V, ms		P value
	Before Exposure, Baseline, Mean ± SD	One Hour After Exposure, Mean ± SD
Group 1 (Control)
1	4.77 ± 0.020	4.77 ± 0.022	1
2	4.74 ± 0.019	4.74 ± 0.019	1
4	4.71 ± 0.016	4.71 ± 0.019	1
8	4.67 ± 0.014	4.67 ± 0.016	1
Group 2 (Noise + Saline)
1	4.77 ± 0.020	5.30 ± 0.040	< 0.001
2	4.74 ± 0.019	5.32 ± 0.059	< 0.001
4	4.71 ± 0.016	5.74 ± 0.04	< 0.001
8	4.67 ± 0.014	5.49 ± 0.051	< 0.001
Group 3 (Noise + NAC a)
1	4.79 ± 0.027	5.03 ± 0.021	< 0.001
2	4.76 ± 0.030	5.08 ± 0.015	< 0.001
4	4.74 ± 0.034	5.23 ± 0.021	< 0.001
8	4.68 ± 0.035	5.27 ± 0.016	< 0.001
Group 4 (NAC)
1	4.77 ± 0.038	4.77 ± 0.037	0.363
2	4.74 ± 0.030	4.75 ± 0.031	0.175
4	4.71 ± 0.024	4.72 ± 0.024	0.175
8	4.67 ± 0.028	4.67 ± 0.027	0.175

^aAbbreviation: NAC, N-acetylcysteine