| Valeur | Catégorie | le cas | |
|---|---|---|---|
| 0 | neither certificate or registered | 1 |
16.7%
|
| 1 | has certificate | 4 |
66.7%
|
| 2 | registered | 1 |
16.7%
|
| 8 | don't know | 0 |
0%
|
| Sysmiss | 13245 |