Demographic characteristics of study subjects for the workers in a synthetic leather (SL) factory and a copper laminate circuit board (CLCB) factory and for the reference group
| Subjects | n | Age* | Working duration* | Cigarette smoking† | Alcohol drinking† |
|---|---|---|---|---|---|
| Mean (range) | Mean (range) | (%) | (%) | ||
| *No significance was found among the three groups (p>0.05) by one way ANOVA test. | |||||
| †No significance was found among the three groups (p>0.05) by χ2 test. | |||||
| Exposed | |||||
| SL | 25 | 37.44 | 6.92 | 66.7% | 41.7% |
| (24–55) | (1–20) | ||||
| CLCB | 20 | 32.95 | 5.7 | 50.0% | 45.0% |
| (22–45) | (1–17) | ||||
| Reference | 20 | 34.20 | 6.40 | 55.0% | 35.0% |
| (28–41) | (1–22) | ||||