| Value | Category |
|---|---|
| 1 | elementary education |
| 2 | upper secondary school (3 years) |
| 3 | upper secondary school (4 years) |
| 4 | post-secondary, non- tertiary |
| 5 | short-cycle tertiary; baschelor?s or equivalent; integrated |
| 6 | post-graduate studies (master?s, doctoral) |
| Sysmiss |