| 变量 | (1) | (2) | (3) | (4) | 
| 0 VS 1,2,3,4 | 0,1 VS 2,3,4 | 0,1,2 VS 3,4 | 0,1,2,3 VS 4 | |
| 性别 | 0.285*** | 0.415*** | 0.725*** | 0.655*** | 
| 
 | (2.63) | (3.58) | (4.66) | (2.95) | 
| 年龄 | 0.639*** | 0.503*** | 0.609*** | 0.311 | 
| 
 | (4.77) | (3.94) | (4.12) | (1.62) | 
| 教育年限 | 0.077*** | 0.055** | 0.086*** | 0.043 | 
| 
 | (3.50) | (2.52) | (3.14) | (1.27) | 
| 婚姻状况 | 0.836*** | 0.949*** | 1.067*** | 1.248*** | 
| 
 | (5.70) | (5.89) | (5.06) | (4.24) |