Age adjusted odds ratio and its 95% CI of hearing loss* according to occupational exposure to noise and smoking in 4624 male workers in a steel factory in Japan, 1999
| Smoker (cigarettes/day) | p value for trend | ||||||||
|---|---|---|---|---|---|---|---|---|---|
| 1–14 | 15–24 | 25+ | |||||||
| Occupational noise exposure | Non-smoker (reference) OR | OR | 95% CI | OR | 95% CI | OR | 95% CI | For all subjects | Among smokers |
| OR, odds ratio; CI, confidence interval. | |||||||||
| *Number of subjects without/with occupational exposure to noise. | |||||||||
| 1321/372* | 238/90 | 1096/598 | 582/326 | ||||||
| 1000 Hz | |||||||||
| No | 1 | 1.2 | 0.6 to 2.7 | 1.3 | 0.9 to 1.9 | 1.1 | 0.7 to 1.8 | 0.38 | 0.71 |
| Yes | 1 | 0.9 | 0.3 to 2.8 | 1.0 | 0.6 to 1.8 | 1.0 | 0.5 to 1.8 | 0.97 | 0.94 |
| 4000 Hz | |||||||||
| No | 1 | 1.8 | 1.1 to 2.9 | 1.9 | 1.4 to 2.4 | 2.1 | 1.6 to 2.9 | <0.001 | 0.31 |
| Yes | 1 | 1.2 | 0.6 to 2.6 | 1.6 | 1.1 to 2.2 | 2.6 | 1.8 to 3.9 | <0.001 | <0.01 |