Respiratory history (frequency) and lung function profile (mean (SD)) for exposed and the unexposed subjects
| Exposed (n=81) | Unexposed (n=113) | p Value | |
| Cough (n (%)) | 31 (38.3) | 9 (7.9) | 0.00012-150 |
| Phlegm (n (%)) | 25 (30.9) | 5 (4.4) | 0.00012-150 |
| Wheeze (n (%)) | 9 (11.1) | 5 (4.4) | 0.062-150 |
| Dyspnoea (n (%)) | 17 (20.9) | 7 (6.2) | 0.0032-150 |
| VC (l, mean (SD)) | 3.15 (0.61) | 3.00 (0.55) | NS2-151 |
| FVC (l, mean (SD)) | 3.20 (0.59) | 3.06 (0.65) | NS2-151 |
| FEF25–75 (l, mean (SD)) | 2.44 (1.09) | 3.80 (1.13) | 0.00012-151 |
| FEV1(l/s, mean (SD)) | 2.42 (0.74) | 2.68 (0.53) | 0.0052-151 |
| FEV1/FVC (%, mean (SD)) | 75.80 (17.75) | 88.47 (9.89) | 0.00012-151 |
| FEV1/VC (%, mean (SD)) | 77.11 (18.78) | 89.82 (10.82) | 0.00012-151 |
| PEF (l, mean (SD)) | 276.36 (145.41) | 426.01 (120.51) | 0.00012-151 |