| Value | Category | 
|---|---|
| 1 | Director and owner od enterprise (public and private sector) | 
| 2 | Proefessionals and artists (with university diploma) | 
| 3 | Qualified blue collars | 
| 4 | White Collars | 
| 5 | Service sector (trade, caterer, craftsman) | 
| 6 | Unqualified and Semi-qualified blue collars | 
| 999998 | REFUSAL | 
| 999999 | DONTKNOW | 
| Sysmiss |