| Value | Category |
|---|---|
| 00 | None or less than primary |
| 01 | Illiterate |
| 02 | Less than primary, literate |
| 10 | Primary general |
| 20 | Basic general |
| 30 | Secondary |
| 31 | Basic vocational |
| 32 | Secondary, specialized |
| 33 | Secondary, general |
| 40 | Higher education |
| 41 | Higher education, incomplete |
| 42 | Bachelor's |
| 43 | Specialist |
| 44 | Master's |
| 45 | Higher education, complete |
| 98 | Unknown |
| 99 | NIU (not in universe) |
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