| Value | Category |
|---|---|
| 1 | School, morning only |
| 2 | School, afternoon only |
| 3 | School, evenings only |
| 4 | Training institution, morning only |
| 5 | Training institution, afternoon only |
| 6 | Training institution, evening only |
| 7 | Week-ends |
| 8 | Other |
| 97 | Not recorded |
| 98 | Not applicable |