| Model | Collinearity Statistics | |
| Tolerance | VIF | |
| AD | 0.843 | 1.186 |
| GD | 0.722 | 1.385 |
| EtD | 0.785 | 1.273 |
| ID | 0.744 | 1.344 |
| BD | 0.741 | 1.349 |
| ED | 0.884 | 1.132 |