| Valeur | Catégorie | le cas | |
|---|---|---|---|
| 0 | Neither certificate or registered | 4 |
3.3%
|
| 1 | Has certificate | 102 |
84.3%
|
| 2 | Registered | 13 |
10.7%
|
| 8 | Don't know | 2 |
1.7%
|
| 9 | 8 | ||
| Sysmiss | 4353 |