| The low back pain level | Worker (n = 17) | |
| Before redesign | After redesign | |
| 0 | 0 (0.00) | 0 (0.00) |
| 1 | 0 (0.00) | 0 (0.00) |
| 2 | 1 (5.88) | 3 (17.65) |
| 3 | 1 (5.88) | 0 (0.00) |
| 4 | 1 (5.88) | 3 (17.65) |
| 5 | 3 (17.65) | 4 (23.53) |
| 6 | 2 (11.76) | 5 (29.41) |
| 7 | 3 (17.65) | 1 (5.88) |
| 8 | 0 (0.00) | 1 (5.88) |
| 9 | 3 (17.65) | 0 (0.00) |
| 10 | 3 (17.65) | 0 (0.00) |