Main characteristics of COPD patients and controls
| Dairy farmers | Cigarette smokers | |||
| COPD (n=32) | Controls (n=32) | COPD (n=39) | Controls (n=12) | |
| Age (yrs) | 59±10 | 58±10 | 62±8 | 63±6 |
| FEV1 (% pred) | 87±14# | 105±10 | 84±13# | 108±12 |
| IC/TLC (%) | 46±9 | 48±7 | 46±4 | 47±7 |
| DLCO (% pred) | 85±11 | 93±13 | 74±14*# | 94±14 |
| PaO2 (mmHg) | 79±10 | 81±7 | 74±9*# | 80±8 |
| Peak workload (% pred) | 84±29# | 101±32 | 83±29# | 98±24 |
| BRS (ms/mmHg) | 9.9±4.9 | 9.7±4.4 | 7.5±3.1*# | 9.8±4.2 |
*p<0.05 vs. COPD in dairy farmers. #: p<0.05 vs. Controls