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Distribution of study subjects according to respiratory symptoms
| Respiratory symptoms | Present workers | Ex-workers |
|---|---|---|
| Cough | 46 (25.0) | 38 (20.8) |
| Phlegm production | 24 (13.0) | 31 (17.0) |
| Hemoptysis | 3 (1.6) | 32 (26.0) |
| Dyspnea | 45 (24.5) | 128 (93.4) |
| Chest pain | 36 (19.6) | 127 (92.7) |
| Loss of weight | 7 (3.8) | 69 (50.4) |
| Evening rise of temperature | 2 (1.1) | 48 (35.3) |
| Loss of appetite | 5 (2.7) | 52 (38.0) |
