| Value | Category |
|---|---|
| 00 | NIU (not in universe) |
| 11 | Less than primary, illiterate |
| 12 | Less than primary, literate |
| 20 | Some primary (grades 1-5) |
| 21 | Primary (grades 1-6 completed) |
| 22 | Preparatory (grades 7-9 completed) |
| 23 | Basic education (grade 10 completed) |
| 30 | Secondary, unspecified track |
| 31 | Vocational secondary |
| 32 | Academic secondary |
| 41 | Intermediate diploma |
| 42 | Bachelor's |
| 43 | Higher diploma |
| 44 | Master's |
| 45 | Ph.D. |
| 99 | Unknown |
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