| Value | Category |
|---|---|
| 0 | none |
| 1 | standard 1 |
| 2 | standard 2 |
| 3 | standard 3 |
| 4 | standard 4 |
| 5 | standard 5 |
| 6 | standard 6 |
| 7 | standard 7 |
| 8 | pre-school |
| 10 | |
| 11 | form 1 |
| 12 | form 2 |
| 13 | form 3 |
| 14 | form 4 |
| 15 | form 5 |
| 16 | diploma/certificate after primary |
| 17 | vocational training after primary |
| 18 | diploma/certificate after secondary |
| 19 | vocational training after secondary |
| 20 | diploma/certificate after high school |
| 21 | vocational training after high school |
| 22 | graduate/post graduate |
| 23 | other |
| 24 | |
| 32 | |
| 38 | |
| 40 | |
| 48 | |
| 58 | |
| 111 | |
| 120 | |
| Sysmiss |