| Valeur | Catégorie | le cas | |
|---|---|---|---|
| 0 | Neither certificate or registered | 12 |
6.4%
|
| 1 | Has certificate | 151 |
80.7%
|
| 2 | Registered | 22 |
11.8%
|
| 8 | Don't know | 2 |
1.1%
|
| 9 | 14 | ||
| Sysmiss | 4281 |