| Control | No | No | Yes | Yes |
| 省份固定效应 | Yes | No | Yes | No |
| 行业固定效应 | Yes | No | Yes | No |
| 个体固定效应 | No | Yes | No | Yes |
| N | 6392 | 6392 | 6391 | 6391 |
| R2 | 0.3363 | 0.8376 | 0.5026 | 0.8712 |