| Value | Category |
|---|---|
| 00 | Less than primary |
| 01 | No schooling |
| 02 | Special education |
| 03 | Preschool |
| 10 | Primary |
| 11 | Primary, grade 1 |
| 12 | Primary, grade 2 |
| 13 | Primary, grade 3 |
| 14 | Primary, grade 4 |
| 15 | Primary, grade 5 |
| 16 | Primary, grade 6 |
| 19 | Primary, grade unknown |
| 20 | Secondary |
| 21 | Secondary, grade 1 |
| 22 | Secondary, grade 2 |
| 23 | Secondary, grade 3 |
| 24 | Secondary, grade 4 |
| 25 | Secondary, grade 5 |
| 26 | Secondary, grade 6 |
| 29 | Secondary, grade unknown |
| 30 | Post-secondary, non-university |
| 31 | Post-secondary non-university, year 1 |
| 32 | Post-secondary non-university, year 2 |
| 33 | Post-secondary non-university, year 3 |
| 39 | Post-secondary non-university, year unknown |
| 40 | Vocational |
| 41 | Vocational, year 1 |
| 42 | Vocational, year 2 |
| 43 | Vocational, year 3 |
| 49 | Vocational, year unknown |
| 50 | University |
| 51 | University, 1 year |
| 52 | University, 2 years |
| 53 | University, 3 years |
| 54 | University, 4 years |
| 55 | University, 5 years |
| 56 | University, 6 years |
| 57 | University, 7 years |
| 58 | University, 8+ years |
| 59 | University, year unknown |
| 60 | Post-graduate |
| 70 | Master's degree |
| 71 | Masters, 1 year |
| 72 | Masters, 2 years |
| 73 | Masters, year unknown |
| 80 | Doctorate |
| 81 | Year 1 or 2 |
| 82 | Doctorate, 1 year |
| 83 | Doctorate, 2 years |
| 84 | Doctorate, 3 years |
| 85 | Doctorate, 4 years |
| 86 | Doctorate, year unknown |
| 98 | Unknown |
| 99 | NIU (not in universe) |