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Distribution of study subjects according to respiratory morbid conditions
| Respiratory morbid condition | Present workers | Ex-workers |
|---|---|---|
| Silicosis | 1 (0.5) | 24 (17.9) |
| Silicotuberculosis | – | 33 (24.6) |
| Tuberculosis | 10 (5.5) | 17 (12.7) |
| Normal | 171 (94.0) | 60 (44.8) |
