| Valeur | Catégorie | le cas | |
|---|---|---|---|
| 0 | neither certificate or registered | 14 |
12.3%
|
| 1 | has certificate | 84 |
73.7%
|
| 2 | registered | 14 |
12.3%
|
| 8 | don't know | 2 |
1.8%
|
| Sysmiss | 13137 |