| I | II | III | IV | |
| Male | Female | Invest | No Invest | |
| dist | 19.013*** | 0.078 | −7.383 | 15.643*** |
| (4.4347) | (3.6129) | (27.5669) | (3.0209) | |
| 控制变量 | 控制 | 控制 | 控制 | 控制 |