| Value | Category | 
|---|---|
| 1 | Vocational, without certificate | 
| 2 | Vocational, with certificate | 
| 3 | Professional or technical, without degree or diploma | 
| 4 | Professional or technical, with degree or diploma | 
| 5 | Apprenticeship | 
| 6 | On the job training | 
| 7 | None | 
| 8 | Not reported | 
| Sysmiss |