| Value | Category |
|---|---|
| 0 | No formal education or below ISCED 1 |
| 1 | Primary education |
| 2 | Lower secondary |
| 3 | Parent |
| 4 | Post-secondary non-tertiary education |
| 5 | Tertiary education first stage - bachelor |
| 6 | Tertiary education first stage - master |
| 7 | Tertiary education second stage |