| Valeur | Catégorie | le cas | |
|---|---|---|---|
| 0 | neither certificate or registered | 5 |
29.4%
|
| 1 | has certificate | 8 |
47.1%
|
| 2 | registered | 3 |
17.6%
|
| 8 | don't know | 1 |
5.9%
|
| Sysmiss | 13234 |