| Value | Category |
|---|---|
| 0 | |
| 1 | Doctor of science |
| 2 | Candidate of science |
| 3 | Higher education |
| 4 | Incomplete higher education |
| 5 | Specialized secondary |
| 6 | Vocational |
| 7 | General secondary |
| 8 | General incomplete |
| 9 | Primary education |
| 10 | Without primary education |
| 11 | Illiterate |
| 12 | Other |