| Value | Category |
|---|---|
| 0 | Not literate |
| 1 | Literate without formal schooling |
| 2 | Literate, but below primary |
| 3 | Primary |
| 4 | Middle |
| 5 | Secondary |
| 6 | Graduate & above in agriculture |
| 7 | Graduate & above in engineering/technology |
| 8 | Graduate & above in medicine |
| 9 | Graduate & above in other subjects |
| Sysmiss |