| Value | Category |
|---|---|
| 1 | Cannot read or write |
| 2 | Can read and write in French |
| 3 | Literate in the national language |
| 4 | Can read in the national language |
| 5 | Literate in French and in the national language |
| 6 | Literate in other foreign lanugage |
| 8 | Unknown |
| 9 | NIU (not in universe) |