| Value | Category |
|---|---|
| 01 | No grade |
| 02 | Preschool |
| 03 | Special education |
| 11 | First primary |
| 12 | Second primary |
| 13 | Third primary |
| 14 | Fourth primary |
| 15 | Fifth primary |
| 16 | Sixth primary |
| 19 | Primary undeclared |
| 21 | First Vocational |
| 22 | Second Vocational |
| 23 | Third vocational |
| 29 | Vocational undeclared |
| 31 | First secondary |
| 32 | Second secondary |
| 33 | Third secondary |
| 34 | Fourth secondary |
| 35 | Fifth secondary |
| 36 | Sixth secondary |
| 39 | Secondary undeclared |
| 41 | First superior non-university |
| 42 | Second superior non-university |
| 43 | Third superior non-university |
| 49 | Superior non-university undeclared |
| 51 | First university |
| 52 | Second university |
| 53 | Third university |
| 54 | Fourth university |
| 55 | Fifth university |
| 56 | Sixth university |
| 59 | University undeclared |
| 61 | Post-graduate |
| 69 | Post-graduate undeclared |
| 71 | First master's-level |
| 72 | Second master's-level |
| 79 | Master's level undeclared |
| 81 | First doctorate-level |
| 82 | Second doctorate-level |
| 83 | Third doctorate-level |
| 84 | Fourth doctorate-level |
| 89 | Doctorate-level undeclared |
| 98 | Unknown |
| 99 | NIU (not in universe) |
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