| Value | Category |
|---|---|
| 1 | None |
| 2 | On-the-job training |
| 3 | Informal skills training |
| 4 | Formal apprenticeship training |
| 5 | Vocational certificate level 1 |
| 6 | Vocational certificate level 2 |
| 7 | Vocational certificate level 3 |
| 8 | Certificate level education |
| 9 | Other (specify) |