| Valeur | Catégorie | le cas | |
|---|---|---|---|
| 0 | Neither certificate or registered | 0 |
0%
|
| 1 | Has certificate | 8 |
72.7%
|
| 2 | Registered | 3 |
27.3%
|
| 8 | Don't know | 0 |
0%
|
| 9 | 1 | ||
| Sysmiss | 4470 |