Comparisons of hearing threshold changes in male workers with unilateral conductive hearing loss exposed to workplace noise: a retrospective cohort study for 8 years

Table 2 Comparisons for hearing threshold changes of SNHL and CHL ear by frequency during follow-up period (N = 78)

	SNHL ear (ΔS)^a (dBHL)		CHL ear (ΔC)^b (dBHL)		Difference between ΔS and ΔC (dBHL)
kHz	Mean	SD^c	Mean	SD^c	Mean	SD^c	p ^*
0.5	7.9	9.7	8.7	10.6	−0.8	8.0	0.389
1	10.3	10.1	11.2	10.7	−1.0	9.8	0.378
2	9.9	10.2	10.5	8.8	−0.6	9.6	0.604
3	9.4	10.2	7.8	9.4	1.6	9.8	0.164
4	8.9	8.5	5.6	9.3	3.2	10.2	0.006
6	4.7	12.0	4.0	10.6	0.7	13.2	0.638

^a ΔS, ^b ΔC, ^* p-value was calculated by paired t-test; ^a ΔS, difference of SNHL ear (2013-2006), p < 0.05; ^b ΔC, difference of CHL ear (2013-2006), p < 0.05; SD^c, standard deviation

ISSN: 2052-4374