| Value | Category |
|---|---|
| -99 | Refuse to answer |
| -98 | Difficult to answer/Don't remember |
| -97 | Don't know/No information |
| -9 | Interrupted interview |
| -7 | Legal Skip |
| -3 | Interviewer error |
| 1 | School |
| 2 | Vocational college |
| 3 | College, training college |
| 4 | University |
| 5 | Postgraduate |
| 6 | Short term training |
| 7 | No |