| Value | Category |
|---|---|
| 0 | illiterate |
| 1 | Primary ((1-4 forms) |
| 2 | General (5-9 forms) |
| 3 | Secondary (10-12 forms) |
| 4 | Preliminary vocational (handicraft, industrial) |
| 5 | Middle vocational (technical college, college) |
| 6 | Higher (bachelor degree, master degree) |
| 7 | Post - Graduate |
| Sysmiss |