| Value | Category |
|---|---|
| 0 | Less than 1 year completed |
| 1 | Standard 1 |
| 2 | Standard 2 |
| 3 | Standard 3 |
| 4 | Standard 4 |
| 5 | Standard 5 |
| 6 | Standard 6 |
| 7 | Standard 7 |
| 8 | Standard 8 |
| 9 | Standard 9 |
| 10 | Standard 10 |
| 11 | Further studies incomplete |
| 12 | Diploma/other postschool complete |
| 13 | Further degree complete |
| 71 | SubA/Class1 |
| 72 | SubB/Class2 |
| 98 | Don't Know |