| Valeur | Catégorie | le cas | |
|---|---|---|---|
| 0 | Neither certificate or registered | 3 |
6.1%
|
| 1 | Has certificate | 38 |
77.6%
|
| 2 | Registered | 8 |
16.3%
|
| 8 | Don't know | 0 |
0%
|
| 9 | 10 | ||
| Sysmiss | 4423 |