| Hellenic Open University graduates | |||
| Number of obs | 8351 | ||
| F-statistic | 256.13** | ||
| Variables | Coefficient | Standard error | p-value |
| D3 | 0.386 | 0.022 | 0.000 |
| D4 | 0.529 | 0.028 | 0.000 |
| Constant | −0.167 | 0.014 | 0.000 |
| Traditional universities graduates | |||
| Number of obs | 4719 | ||
| F-statistic | 5.23** | ||
| Variables | Coefficient | Standard error | p-value |
| D3 | 0.073 | 0.041 | 0.079 |
| D4 | 0.141 | 0.048 | 0.003 |
| Constant | −0.026 | 0.017 | 0.137 |