| Value | Category | 
|---|---|
| 1 | No schooling | 
| 2 | unfinished elementary school | 
| 3 | Elementary school | 
| 4 | Vocational school -1-2 years | 
| 5 | Secondary, 3 years and school for skilled workers | 
| 6 | Second.4 years and school for highly skilled workers | 
| 7 | Gymnasium | 
| 8 | Post secondary | 
| 9 | University | 
| 10 | M.A. degree, specialization | 
| 11 | Doctorate | 
| 98 | REFUSAL | 
| 99 | DONTKNOW |