| Variables | Estimated Coefficient | ||
| Model (1) | Model (2) | Model (3) | |
| Constant | −4.40*** | −4.41*** | −4.43*** |
| SDI | −0.05* | −0.05* | −0.04 |
| SDI × PC | 0.03** |
|
|
| SDI × PCI |
| 0.8* |
|
| SDI × △PCI |
|
| 0.08* |
| STATE | −0.02 | −0.02 | −0.02 |
| Adjust R2 | 0.1342 | 0.1341 | 0.1340 |
| F | 58.28*** | 58.24*** | 58.21*** |