| Value | Category |
|---|---|
| 0 | |
| 1 | no education |
| 2 | incomplete elementary school |
| 3 | elementary school |
| 4 | one/two-year vocational school |
| 5 | secondary - three years for skilled worker |
| 6 | secondary-four years for highly skilled worker |
| 7 | gymnasium |
| 8 | college |
| 9 | university (faculty) |
| 10 | master's degree - specialization |
| 11 | doctorate |
| Sysmiss |