| Variables | WT | SL | BL | BH | RC | HG |
| WT | 1 | 0.81 | 0.74 | 0.85 | 0.85 | 0.81 |
| SL | 1 | 0.68 | 0.71 | 0.73 | 0.76 | |
| BL | 1 | 0.76 | 0.84 | 0.79 | ||
| BH | 1 | 0.78 | 0.68 | |||
| RC | 1 | 0.86 | ||||
| HG | 1 |