| Variable | Dairy Farmers (n = 52) | Office Workers (n = 52) |
|---|---|---|
| Mean age (years) | 49.4 ± 5.1 | 48.7 ± 4.9 |
| Age range (years) | 26 - 59 | 27 - 58 |
| Less than 45 years | 24 (46.2%) | 27 (51.9%) |
| More than 45 years | 28 (53.8%) | 25 (48.1%) |
| BMI (kg/m2) | 24.5 ± 3.9 | 25.1 ± 3.7 |
| Mean duration of employment (years) | 21.6 ± 5.3 | 20.2 ± 5.1 |
| Duration of employment less than 20 years | 25 (48.1%) | 28 (53.8%) |
| Duration of employment more than 20 years | 27 (51.9%) | 24 (46.2%) |
| Family history of COPD or CB | 6 (11.5%) | 3 (5.8%) |
| Environmental ETS | 20 (38.5%) | 18 (34.6%) |
| Exposed less than 4 hours | 13 (25%) | 10 (19.2%) |
| Exposed more than 4 hours | 7 (13.5%) | 8 (15.4%) |
| Accompanying diseases | ||
| Arterial hypertension | 8 (15.4%) | 10 (19.2%) |
| Diabetes mellitus type 2 | 3 (5.8%) | 4 (7.7%) |
| Peptic ulcer | 6 (11.5%) | 5 (9.6%) |