Table 1. Characteristic of the study population.

	Case group (n = 73)	Control group (n = 87)	P-Value
Age (years)* (Mean±SD)	35.12 ± 3.85	34.71 ± 4.21	0.07
Employment (years)† (Mean±SD)	6.40 ± 2.39	6.37 ± 1.72	0.90
Noise exposure (TWA) dBA† (Mean±SD)	90.14 ± 2.59	89.72 ± 2.32	0.26
Smoking‡ 9N (%)]	19 (26.00%)	14 (16.10%)	0.09

Note: *Student's t-test; ^†Mann-Whitney test; ^‡Chi-square test.