| Value | Category |
|---|---|
| 1 | DoNotKnow |
| 2 | non_formal |
| 3 | other |
| 4 | preparatory |
| 5 | preparatory support |
| 6 | regular |
| 7 | regular non_formal |
| 8 | regular preparatory |
| 9 | regular preparatory non_formal |
| 10 | regular preparatory support |
| 11 | regular preparatory support non_formal |
| 12 | regular support |
| 13 | regular support non_formal |
| 14 | support |
| 15 | support non_formal |
| Missing value |