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| Independent variables | Correlation coefficient | P value |
|---|---|---|
| GDP-per-capita (X1,Yuan) | 0.87 | 0.000 |
| Education level (X2, 104 persons) | 0.83 | 0.000 |
| Health institutions(X3) | 0.84 | 0.000 |
| Population (X4, 104 persons) | 0.86 | 0.000 |
| Car ownership (X5, 104 vehicles) | 0.95 | 0.000 |
