| Valeur | Catégorie | le cas | |
|---|---|---|---|
| 0 | neither certificate or registered | 8 |
14.8%
|
| 1 | has certificate | 35 |
64.8%
|
| 2 | registered | 9 |
16.7%
|
| 8 | don't know | 2 |
3.7%
|
| Sysmiss | 13197 |