Characteristics of the study subjects according to occupational exposure to noise and smoking status
| Non-smoker (n=1693) | Smoker (n=2931) | |||
|---|---|---|---|---|
| n | % | n | % | |
| Occupational noise exposure | ||||
| No | 1321 | 78 | 1917 | 65 |
| Yes | 372 | 22 | 1014 | 35 |
| Age (y) | ||||
| ≤39 | 680 | 40 | 907 | 31 |
| 40–49 | 671 | 40 | 1474 | 50 |
| 50–60 | 342 | 20 | 550 | 19 |