| Valeur | Catégorie | le cas | |
|---|---|---|---|
| 0 | Neither certificate or registered | 1 |
9.1%
|
| 1 | Has certificate | 10 |
90.9%
|
| 2 | Registered | 0 |
0%
|
| 8 | Don't know | 0 |
0%
|
| 9 | 1 | ||
| Sysmiss | 4470 |