| Value | Category |
|---|---|
| 0 | No education |
| 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 | Course after primary school |
| 10 | Form 1 |
| 11 | Form 2 |
| 12 | Form 3 |
| 13 | Form 4 |
| 14 | Course after secondary school |
| 15 | Form 5 |
| 16 | Form 6 |
| 17 | Other certificate |
| 18 | Diploma course |
| 19 | Degree |
| 20 | Adult education only |