| Name and designation of factors | Change levels | Change interval | ||
| −1 | 0 | +1 | ||
| The front length of the loop strip of knitted fabric | 1.5 | 2.5 | 3.5 | 1 |
| Knitted fabric loop step | 0.4 | 0.5 | 0.6 | 0.1 |
| Changes in the fiber content of fabric yarns | 95% cotton, 5% laycra | 75% cotton, 23% poly, 2% laycra | 75% cotton, 25% poly | - |