|
Phase 2
|
Phase 3
|
Factories (n) | 19 | 16 |
Total population (n) | 2955 | 2394 |
Participants (n) | 2646 | 2281 |
Workers included in analyses (n) | 2324 | 1994 |
Age, mean (range)(y) | 41 (19–64) | 41 (18–64) |
Current smokers (%) | 48 | 45 |
Ex-smokers (%) | 27 | 29 |
Duration of employment (months) | 174.5 | 177.9 |
Current inhalable dust exposure (mg.m−3) | 0.77 | 0.57 |
Cumulative inhalable dust exposure (mg.month.m−3) | 263.2 | 245.9 |
Prevalence of cough (%) | 14.2 | 13.3 |
Prevalence of sputum (%) | 14.2 | 11.6 |
Prevalence of cough and sputum (%) | 8.3 | 7.4 |
Prevalence of chronic bronchitis (%) | 4.1 | 3.7 |
Workers with valid spirometry traces (n (%)) | 2235 (96.0) | 1882 (94.4) |
Predicted FEV1 (SD) (%) | 104.4 (14.5) | 104.1 (13.9) |
Predicted FVC (SD) (%) | 110.4 (13.6) | 109.9 (13.2) |
Predicted FEF25%–75% (SD) (%) | 93.4 (30.3) | 92.3 (28.7) |
Predicted FEV1/FVC ratio (SD) (%) | 90.7 (8.8) | 90.8 (8.1) |