| Variables | Estimated Coefficient | ||
| Model (1) | Model (2) | Model (3) | |
| Constant | −2.79*** | −2.81*** | −2.76*** |
| SDI | 0.02*** | 0.02*** | 0.01 |
| SDI × PC | −0.03*** |
|
|
| SDI × PCI |
| 0.01*** |
|
| SDI × △PCI |
|
| 0.00 |
| STATE | −0.08*** | −0.08*** | −0.08*** |
| Adjust R2 | 0.1088 | 0.1090 | 0.1082 |
| F | 52.55*** | 52.65*** | 52.24*** |