| Value | Category |
|---|---|
| 00 | Less than primary |
| 01 | Less than primary, illiterate |
| 02 | Less than primary, literate |
| 10 | Primary |
| 20 | Secondary |
| 21 | Lower secondary (grades 4-8) |
| 22 | Upper secondary (grades 9-10) |
| 30 | Technical vocational, unspecified |
| 31 | Post-primary technical |
| 32 | Secondary or post-secondary technical |
| 40 | Higher education |
| 41 | Some higher education |
| 42 | Completed higher education |
| 99 | NIU (not in universe) |
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