| Number (n) | Percentage (%) |
Noise from cutting and hammering | 41 | 33.61 |
Noise from cutting | 33 | 27.05 |
Noise from hammering | 17 | 13.93 |
Noise from welding | 6 | 4.92 |
Nothing | 25 | 20.49 |
Total | 122 | 100 |