| Value | Category |
|---|---|
| -9 | Break-off |
| -7 | Legal skip |
| -3 | Interviewer error |
| 1 | No education or did not complete primary education |
| 2 | Primary general education |
| 3 | Basic general education |
| 4 | Secondary general education / Professional Diploma |
| 5 | Higher education |
| 6 | PhD, Candidate of Science or higher |
| 9 | Don't know |