| Value | Category |
|---|---|
| 0 | Smaller than six years old or literate |
| 1 | Illeterate but not completed any educational institution |
| 2 | Primary school |
| 3 | Secondary school, vocational school at secondary school level or primary education |
| 4 | High school |
| 5 | Vocational or technical high school |
| 6 | Higher education (university, faculty or upper) |