Table 3

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
Occupational noise exposureNon-smoker (reference) OROR95% CIOR95% CIOR95% CIFor all subjectsAmong smokers
OR, odds ratio; CI, confidence interval.
*Number of subjects without/with occupational exposure to noise.
1000 Hz
    No11.20.6 to to to 1.8 0.380.71
    Yes10.90.3 to to to 1.8 0.970.94
4000 Hz
    No11.81.1 to to to 2.9<0.0010.31
    Yes11.20.6 to to to 3.9<0.001<0.01