Table 3 Correlation analysis between VTV and each potential factor
Code | X1 | X2 | X3 | X4 | X5 | X6 | X7 | X8 | X9 |
|---|---|---|---|---|---|---|---|---|---|
Correlation Coefficient |  − 0.422** |  − 0.474** |  − 0.492** |  − 0.285** |  − 0.513** | –0.425** |  − 0.514** |  − 0.511** | − 0.605** |
Significance | 0.000 | 0.000 | 0.000 | 0.000 | 0.000 | 0.000 | 0.008 | 0.000 | 0.000 |