| Value | Category |
|---|---|
| 1 | (Primary) Elementary education (classes I-V) |
| 2 | Low secondary education (classes VI-IX) |
| 3 | Upper secondary - general (gymnasium - 3 or 4 years) |
| 4 | Upper secondary - vocational (2 or 3 or 4 years) |
| 5 | Tertiary / University |
| 6 | Post graduate / Master |
| 7 | Doctorate |
| Sysmiss |