| 变量 | 东部地区 (1) | 中部地区 (2) | 西部地区 (3) | 东北地区 (4) |
| Dige | −0.741*** (0.191) | −0.326 (0.407) | −0.374*** (0.139) | −0.536 (0.443) |
| lnGDP | 0.733*** (0.147) | −0.568*** (0.159) | −0.028 (0.110) | −0.036 (0.084) |
| lnSTRU | 0.526*** (0.140) | −0.538*** (0.153) | 0.223** (0.097) | −0.106 (0.073) |
| lnFirst | −0.111 (0.142) | 0.398*** (0.120) | −0.253** (0.107) | 0.355*** (0.123) |
| HC | −7.644 (5.227) | 2.929 (1.929) | 1.304 (1.510) | 20.181*** (6.505) |
| lnPOPU | 0.687 (0.453) | 1.178* (0.658) | 1.194*** (0.215) | −0.056 (0.482) |
| _cons | −3.579** (1.396) | 1.361 (1.663) | 1.699*** (0.418) | 1.418 (1.613) |
| N | 100 | 60 | 120 | 30 |
| Province | Yes | Yes | Yes | Yes |
| Year | Yes | Yes | Yes | Yes |