| Value | Category |
|---|---|
| 0 | None |
| 1 | Pre-school |
| 11 | Primary 1 |
| 12 | Primary 2 |
| 13 | Primary 3 |
| 14 | Primary 4 |
| 15 | Primary 5 |
| 16 | Primary 6 |
| 17 | Primary 7 |
| 18 | Primary 8 |
| 21 | Secondary 1 |
| 22 | Secondary 2 |
| 23 | Secondary 3 |
| 24 | Secondary 4 |
| 25 | Secondary 5 |
| 26 | Secondary 6 |
| 31 | University |
| 41 | Post-primary education |
| 42 | Post-secondary education |
| 43 | Adult education |
| Sysmiss |