Early detection of noise-induced hearing loss

Table 4 Chi-square test results for extended high-frequency audiometry (n = 159)

Ear	Frequency (kHz)	Group	Normal (N)	Abnormal (N)	Abnormalrate (%)	χ2	P value
Right	9	0	56	5	8.2	1.33	0.25
		1	84	14	14.3
	10	0	51	10	16.4	2.62	0.11
		1	71	27	27.6
	11.2	0	58	3	4.9	2.36	0.12
		1	86	12	12.2
	12.5	0	54	7	11.5	2.13	0.15
		1	78	20	20.4
	14	0	51	10	16.4	1.47	0.23
		1	74	24	24.5
	16	0	52	9	14.8	1.09	0.30
		1	77	21	21.4
	18	0	60	1	1.6		1.00a
		1	95	3	3.1
	20	0	57	4	6.6		0.77a
		1	90	8	8.2
Left	9	0	52	9	14.8	0.19	0.67
		1	81	17	17.3
	10	0	45	16	26.2	0.74	0.39
		1	66	32	32.7
	11.2	0	53	8	13.1	1.02	0.31
		1	90	8	10.1
	12.5	0	51	10	16.4	0.03	0.86
		1	83	15	15.3
	14	0	50	11	18.0	0.05	0.83
		1	79	19	19.4
	16	0	50	11	18.0	0.05	0.83
		1	79	19	19.4
	18	0	57	4	6.6		0.77a
		1	90	8	8.2
	20	0	56	5	8.2	1.33	0.25
		1	84	14	14.3

^aFisher’s exact probability. 0: Low noise exposure group; 1: Noise exposure group.