| Value | Category |
|---|---|
| 0 | Ignorant |
| 10 | Basic |
| 20 | Secondary |
| 31 | Vocational |
| 32 | Secondary schools |
| 33 | Secondary vocational |
| 40 | Post-secondary |
| 51 | Teacher training colleges, foreign language or for social workers |
| 52 | Bachelor's or engineer |
| 53 | MA or equivalent |
| 60 | The higher the degree of scientific |
| Sysmiss |