| X1 | X2 | X3 | X4 | X5 | X6 | Average value |
Guangzhou | 0.617 | 0.634 | 0.742 | 0.716 | 0.672 | 0.630 | 0.668 |
Shenzhen | 0.678 | 0.790 | 0.673 | 0.752 | 0.649 | 0.611 | 0.692 |
Zhuhai | 0.781 | 0.744 | 0.609 | 0.697 | 0.710 | 0.677 | 0.703 |
Dongguan | 0.629 | 0.610 | 0.601 | 0.616 | 0.612 | 0.749 | 0.636 |
Huizhou | 0.733 | 0.720 | 0.644 | 0.785 | 0.715 | 0.767 | 0.727 |
Shanghai | 0.685 | 0.703 | 0.641 | 0.822 | 0.757 | 0.645 | 0.709 |
Average value | 0.688 | 0.699 | 0.654 | 0.713 | 0.671 | 0.687 | 0.685 |