| Valeur | Catégorie | le cas | |
|---|---|---|---|
| 0 | Neither certificate or registered | 0 |
0%
|
| 1 | Has certificate | 18 |
90%
|
| 2 | Registered | 1 |
5%
|
| 8 | Don't know | 1 |
5%
|
| Sysmiss | 4462 |