Age, employment, hearing, and smoking characteristics of subjects
| Site A | Site B | |
|---|---|---|
| *Averaged across both ears and frequencies 0.5, 1, 2, 4 kHz. | ||
| All subjects | n = 186 | n = 150 |
| Median (range) length of employment prior to audiogram (years) | 19 (5–38) | 25 (6–40) |
| Median (range) age at audiogram (years) | 57 (45–65) | 59 (45–65) |
| Median (range) of hearing level*, dB | 27 (9–81) | 25 (1–80) |
| Smoking, n (% of total) | ||
| Never | 34 (18%) | 24 (16%) |
| Ex-smoker | 55 (30%) | 47 (31%) |
| Current | 97 (52%) | 79 (53%) |