| Value | Category | 
|---|---|
| 0 | N/A | 
| 1 | no primary | 
| 2 | general primary | 
| 3 | incomplete secondary | 
| 4 | complete secondary | 
| 5 | vocational training with diploma on secondary education | 
| 6 | vocational training without diploma on secondary education | 
| 7 | secondary professional (secondary special) | 
| 8 | incomplete higher education | 
| 9 | higher education | 
| 10 | postgraduate education |