| Features | Percentage (n = 108) |
| Respiratory problem in the preceding year | 25.9 |
| Current respiratory problem | 44.4 |
| Current respiratory problems that was increasing day by day | 68.7 |
| Current respiratory problems by feeling better on weekly holidays | 31.3 |
| Respiratory symptoms | |
| Nasal Irritation | 50.0 |
| Hoarseness of voice | 89.6 |
| Cough when do not catch cold | 50.0 |
| Bringing up phlegm when do not catch cold | 25.0 |
| Wheeze | 70.8 |
| Tightness of chest | 37.5 |
| Shortness of breath during hurrying or walking up | 25.0 |
| Use of mask in working place | 8.3 |