Study subjects, n=399 | Subgroup with at least four lung function data points, n=218 | |
Male subjects, % (n) | 61.2 (244) | 62.84 (137) |
Mean age in years (SEM) | 50.12 (0.17) | 51.09 (0.70) |
Current smokers, % (n) | 8.7 (35) | 7.80 (17) |
Mean pack-year exposure (SEM) | 16.89 (0.24) | 15.73 (0.32) |
Index cases, % (n) | 74.1 (296) | 79.6 (174) |
Currently working, % (n) | 67.3 (268) | 70.8 (154) |
Level of occupational risk in those still working, % (n) | High: 10.5 (28) Low: 20.4 (55) Zero: 69.1 (185) | High: 18.2 (28) Low: 32.5 (50) Zero: 49.4 (76) |
Mean FEV1, %predicted (SEM) | 51.28 (0.50) | 57.41 (0.73) |
Mean KCO, %predicted (SEM) | 73.31 (0.45) | 68.47 (0.57) |
Chronic bronchitis, % (n) | 35.4 (141) | 38.2 (83) |
Mean decline of FEV1 in ml/year (SEM) | −32.66 (2.06) | −34.84 (3.12) |
Mean decline of KCO in (mmol/min/kPa/l)/year (SEM) | −0.03 (0.004) | −0.02 (0.007) |
Exacerbations per year | 1.00 (0.33) | 1.00 (0.33) |
Data are expressed as mean (SEM) for quantitative variables and are expressed as % of the cohort (n) for qualitative variables.