| Value | Category |
|---|---|
| 1 | None, and I do not know how to read or write |
| 2 | None, but I know how to read and write |
| 3 | Some primary school |
| 4 | Completed primary school |
| 5 | Some secondary school |
| 6 | Completed secondary school |
| 7 | Some university studies |
| 8 | Technical school |
| 9 | University graduate |
| 10 | Graduate or professional degree |
| 99 | Don’t know/No answer |