| Value | Category |
|---|---|
| 1 | None |
| 2 | Primary incomplete |
| 3 | Primary |
| 4 | Secondary technical/vocational incomplete |
| 5 | Secondary technical/vocational |
| 6 | Secondary university preparatory incomplete |
| 7 | Secondary university preparatory |
| 8 | Some university education |
| 9 | University degree |
| -4 | Not asked |
| -3 | Not applicable |
| -2 | NA |
| -1 | DK |