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Characteristics of participants
| Characteristics | n | % |
|---|---|---|
| Men | 7 | 70.0 |
| Age (years), mean (SD; range) | 40.2 | (6.5; 32–52) |
| Smoking status | ||
| Smoker | 1 | 10.0 |
| Non-daily smoker | 1 | 10.0 |
| Former smoker | 3 | 30.0 |
| Never smoker | 5 | 50.0 |
| Duration of employment (years), mean (SD; range) | 5.7 | (3.3; 0.33–10) |
