| Valeur | Catégorie | le cas | |
|---|---|---|---|
| 0 | Neither certificate or registered | 10 |
28.6%
|
| 1 | Has certificate | 15 |
42.9%
|
| 2 | Registered | 10 |
28.6%
|
| 8 | Don't know | 0 |
0%
|
| Sysmiss | 14389 |