| 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 |