| Variable | Increment control variable | Eliminate important provinces | Shortening sample interval | |
| (1) | (2) | (3) | (4) | |
| Green finance composite index | 1.191135** | 1.3549065*** | 1.148108** | 1.433951*** |
| (0.4600469) | (0.46595974) | (0.5239981) | (0.3978341) | |
| Proportion of people in higher education | −0.0426688* | −0.0398956* |
|
|
| (0.0223372) | (0.0226239) |
|
| |
| Per capita GDP |
| −0.1385438 |
|
|
|
| (0.176459) |
|
| |
| Control variable | YES | YES | YES | YES |
| Number of provinces | 30 | 30 | 26 | 30 |
| Observed value | 300 | 300 | 260 | 150 |