| Valeur | Catégorie | le cas | |
|---|---|---|---|
| 0 | neither certificate or registered | 44 |
14.6%
|
| 1 | has certificate | 223 |
73.8%
|
| 2 | registered | 26 |
8.6%
|
| 8 | don't know | 9 |
3%
|
| Sysmiss | 12949 |