| Spirometry results | Asthma aggravated by work N (%) | |||
| No | Yes | Total | p | |
| Normal | 475 (80.78) | 7 (63.64) | 482 (80.47) | 0.175 |
| Asthma | 17 (2.89) | 1 (9.09) | 18 (3.01) | |
| Bronchial obstruction | 57 (9.69) | 3 (27.27) | 60 (10.02) | |
| Bronchial restriction | 34 (5.78) | 0 (00.00) | 34 (5.68) | |
| Mixed syndrome | 5 (0.85) | 0 (00.00) | 5 (0.83) | |
| Total | 588 (98.16) | 11 (1.84) | 599 (100) | |