Variables | Cases (n = 432) | Controls (n = 837) | P | ||
---|---|---|---|---|---|
n | % | n | % | Â | |
Age (years) | 0.09a | ||||
Mean ± SD | 47.85 ± 5.48 | 47.43 ± 5.38 | 0.18b | ||
 ≤ 35 | 13 | 1.0 | 26 | 2.1 |  |
35–45 | 89 | 7.0 | 219 | 17.3 |  |
 > 45 | 330 | 26.0 | 592 | 46.7 |  |
Sex | 0.40a | ||||
Male | 392 | 30.9 | 771 | 60.8 | Â |
Female | 40 | 3.2 | 66 | 5.2 | Â |
Tobacco use | 0.93a | ||||
Now | 194 | 15.3 | 372 | 29.3 | Â |
Ever | 170 | 13.4 | 338 | 26.6 | Â |
Never | 68 | 5.4 | 127 | 10.0 | Â |
Alcohol consumption | 0.79a | ||||
Now | 192 | 15.1 | 356 | 28.1 | Â |
Ever | 33 | 2.6 | 63 | 5.0 | Â |
Never | 207 | 16.3 | 418 | 32.9 | Â |
Duration of noise exposed work (years) | 0.75a | ||||
Mean ± SD | 23.72 ± 10.58 | 23.68 ± 10.55 | 0.95b | ||
 ≤ 16 | 84 | 6.6 | 169 | 13.3 |  |
 > 16 | 348 | 27.4 | 668 | 52.6 |  |
Noise exposure levels (dB) | 0.17a | ||||
 ≤ 85 | 265 | 20.9 | 474 | 37.4 |  |
85–92 | 126 | 9.9 | 288 | 22.7 |  |
 > 92 | 41 | 3.2 | 75 | 5.9 |  |
High frequency hearing thresholds (dB) |  < 0.001 a | ||||
Mean ± SD | 0.64 ± 0.48 |  | 0 |  < 0.001 b | |
 ≤ 26 | 155 | 12.2 | 837 | 66.0 |  |
 > 26 | 277 | 21.4 | 0 | 0.0 |  |