| Table 3: Frequency (%) of respiratory symptoms in the exposed and unexposed workers | |||
| Symptom | Unexposed (n=99) | Exposed (n=194) | OR (95% CI) |
| Cough | 9 (9) | 45 (23.2) | 2.9 (1.4 to 6.3) |
| Phlegm | 13 (13) | 51 (26.3) | 2.3 (1.2 to 4.5) |
| Productive cough | 10 (10) | 49 (25.3) | 2.9(1.4 to 6.0) |
| Wheezing | 8 (8) | 37 (19.1) | 2.7 (1.2 to 6) |
| Breathlessness | 11 (11) | 39 (20.1) | 2 (1 to 4) |
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