| Value | Category |
|---|---|
| 1 | No formal education |
| 2 | 1-3 years of elementary school |
| 3 | 4-7 years of elementary school |
| 4 | Elementary school |
| 5 | School for craft and industrial occupations |
| 6 | Technical, economic, health and other secondary schools |
| 7 | Grammar school |
| 8 | Non-university college |
| 9 | University, academy |
| 10 | Master’s degree |
| 11 | Doctorate (PhD) |
| 99 | |
| Sysmiss |