| Valeur | Catégorie | le cas | |
|---|---|---|---|
| 0 | neither certificate or registered | 14 |
16.7%
|
| 1 | has certificate | 56 |
66.7%
|
| 2 | registered | 12 |
14.3%
|
| 8 | don't know | 2 |
2.4%
|
| Sysmiss | 13167 |