| Value | Category |
|---|---|
| 1 | No school |
| 2 | (Primary) Elementary education (cl. I-IV/V) |
| 3 | 8/9-years school (cl. V-VIII/IX) |
| 4 | Upper secondary - vocational 2-3 years |
| 5 | Upper secondary - vocational 4-5 years |
| 6 | Upper Secondary - general (gymnasium) |
| 7 | High - school |
| 8 | Tertiary / University |
| 9 | Post university / Master |
| 10 | Doctorate |
| Sysmiss |