| Valeur | Catégorie | le cas | |
|---|---|---|---|
| 0 | Neither certificate or registered | 0 |
0%
|
| 1 | Has certificate | 2 |
66.7%
|
| 2 | Registered | 1 |
33.3%
|
| 8 | Don't know | 0 |
0%
|
| Sysmiss | 4479 |