| Term | Coef. | SE coef. | T | P | Description |
| Constant | 0.859688 | 0.01007 | 85.334 | 0.000 | Significant |
| Angle | −0.199233 | 0.01072 | −18.577 | 0.000 | Significant |
| Load | 0.062033 | 0.01072 | 5.784 | 0.000 | Significant |
| Angle × angle | −0.097553 | 0.01561 | −6.251 | 0.000 | Significant |
| Load × load | -0.007553 | 0.01561 | −0.484 | 0.641 | Non-significant |
| Angle × load | 0.023950 | 0.01314 | 1.823 | 0.106 | Non-significant |