Worker characteristics
| All | Group 1 | Group 2 | Group 3 | Group 4 | |
|---|---|---|---|---|---|
| Serum indium concentration, ng/mL | 0.2–126.7 | 0.2–3.6 | 3.7–9.9 | 10.0–22.4 | 22.5–126.7 |
| Subjects, n | 84 | 21 | 21 | 21 | 21 |
| Former workers, n (in 2010) | 37 | 6 | 5 | 9 | 17 |
| Former workers, n (in 2002) | 21 | 6 | 4 | 3 | 8 |
| Age, year (in 2002) | 33.9±7.9 | 35.9±8.4 | 33.7±7.8 | 32.8±9.1 | 33.3±6.1 |
| Exposure period, years (in 2010) | 9.7±4.8 | 7.0±4.5 | 9.0±4.2 | 11.6±4.3 | 11.5±4.5 |
| Period from first exposure, years (in 2010) | 14.5±4.8 | 12.7±5.4 | 13.1±4.0 | 14.4±4.1 | 17.7±3.8 |
| Period from last exposure, years* (in 2010) | 3.9±5.3 | 4.1±6.4 | 3.3±6.2 | 2.2±3.3 | 5.9±3.9 |
| Smokers (current and/or former), n (in 2010) | 68 | 18 | 19 | 16 | 15 |
| Smokers in subjects, % (in 2010) | 81.0 | 85.7 | 90.5 | 76.2 | 71.4 |
| Smoking history, pack-years (in 2010) | 14.4±9.0 | 16.2±9.0 | 15.7±9.1 | 12.0±8.7 | 13.4±8.6 |
Data for age, exposure period and smoking history are expressed as mean±SD. Period from last exposure was calculated among the former workers.
*Period from the last exposure was assumed to be 0 in the current workers. The value of mean pack-years is calculated only in the smokers.