| Value | Category |
|---|---|
| 1 | Illiterate |
| 2 | Literate but not a graduate of school |
| 3 | Primary school (5 years) |
| 4 | Primary education (8 years) |
| 5 | General or vocational lower-secondary school |
| 6 | General upper-secondary school |
| 7 | Vocational or technical upper-secondary school |
| 8 | Higher school |
| 9 | University |
| 10 | Graduate/doctorate |