| Valeur | Catégorie | le cas | |
|---|---|---|---|
| 0 | Neither certificate or registered | 1 |
2.5%
|
| 1 | Has certificate | 35 |
87.5%
|
| 2 | Registered | 4 |
10%
|
| 8 | Don't know | 0 |
0%
|
| 9 | 5 | ||
| Sysmiss | 4437 |