| Value | Category |
|---|---|
| -9 | Don't know |
| -7 | Legal skip |
| -6 | Unfinished questionnaire |
| -3 | Interviewer error |
| 1 | NO FORMAL EDUCATION OR BELOW COMPLETED PRIMARY |
| 2 | Primary |
| 3 | Basic general education |
| 4 | Secondary general education |
| 5 | Preliminary Vocational Education |
| 6 | Middle Vocational Education |
| 7 | Secondary specialized education |
| 8 | Bachelor degree |
| 9 | Masters degree |
| 10 | Candidate of Science |
| 11 | Doctor of Science |