| Valeur | Catégorie | le cas | |
|---|---|---|---|
| 0 | Neither certificate or registered | 2 |
3.1%
|
| 1 | Has certificate | 59 |
92.2%
|
| 2 | Registered | 3 |
4.7%
|
| 8 | Don't know | 0 |
0%
|
| 9 | 7 | ||
| Sysmiss | 4411 |