| Valeur | Catégorie | le cas | |
|---|---|---|---|
| 0 | neither certificate or registered | 8 |
20%
|
| 1 | has certificate | 22 |
55%
|
| 2 | registered | 7 |
17.5%
|
| 8 | don't know | 3 |
7.5%
|
| Sysmiss | 13211 |