| Valeur | Catégorie | le cas | |
|---|---|---|---|
| 0 | Neither certificate or registered | 4 |
23.5%
|
| 1 | Has certificate | 10 |
58.8%
|
| 2 | Registered | 3 |
17.6%
|
| 8 | Don't know | 0 |
0%
|
| Sysmiss | 14407 |