| Value | Category |
|---|---|
| 00 | None |
| 11 | Primary 1 |
| 12 | Primary 2 |
| 13 | Primary 3 |
| 14 | Primary 4 |
| 15 | Primary 5 |
| 16 | Primary 6 |
| 21 | Lower secondary 1 |
| 22 | Lower secondary 2 |
| 23 | Lower secondary 3 |
| 24 | Lower secondary 4 |
| 31 | Upper secondary 1 |
| 32 | Upper secondary 2 |
| 33 | Upper secondary 3 |
| 41 | Vocation education first level |
| 42 | Vocation education middle level |
| 43 | Vocation education high level or university |
| 44 | Post graduate level |
| 45 | Others |
| 98 | Unknown |
| 99 | NIU (not in universe) |
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