| Valeur | Catégorie | le cas | |
|---|---|---|---|
| 0 | Neither certificate or registered | 2 |
18.2%
|
| 1 | Has certificate | 8 |
72.7%
|
| 2 | Registered | 1 |
9.1%
|
| 8 | Don't know | 0 |
0%
|
| Sysmiss | 14413 |