| Value | Category |
|---|---|
| -9 | Don't know |
| 1 | No formal education or kindergarten only |
| 2 | Some Primary, not completed (1-4) |
| 3 | Primary completed (5-8/9) |
| 4 | Secondary (vocational, gymnasium, orthodox or Islamic secondary) |
| 5 | Post-secondary specialist/ Professional college |
| 6 | Bachelor, Masters degree |
| 7 | Doctorate degree |
| Sysmiss |