| Value | Category |
|---|---|
| 1 | higher, ph.d. |
| 2 | higher, master |
| 3 | higher, bachelor |
| 4 | higher, specialist |
| 5 | secondary specialized |
| 6 | secondary vocational-technical |
| 7 | secondary |
| 8 | vocational-technical |
| 9 | primary |
| 10 | initial |
| 11 | not finished initial |
| 12 | never been to school |
| Sysmiss |