| Value | Category |
|---|---|
| 10 | Not literate |
| 21 | Literate without formal schooling: through attending NFEC |
| 22 | Literate without formal schooling: through attending AEC |
| 23 | Literate without formal schooling: through other means |
| 30 | Literate but below primary |
| 40 | Primary |
| 50 | Middle |
| 60 | Secondary |
| 70 | Higher Secondary |
| 80 | Graduate and above |
| Sysmiss |