| Value | Category |
|---|---|
| 1 | No schooling |
| 2 | unfinished elementary school |
| 3 | Elementary school |
| 4 | Vocational school -1-2 years |
| 5 | Secondary, 3 years and school for skilled workers |
| 6 | Second.4 years and school for highly skilled workers |
| 7 | Gymnasium |
| 8 | Post secondary |
| 9 | University |
| 10 | M.A. degree, specialization |
| 11 | Doctorate |
| 98 | REFUSAL |
| 99 | DONTKNOW |