| Valeur | Catégorie | le cas | |
|---|---|---|---|
| 0 | Neither certificate or registered | 23 |
6.4%
|
| 1 | Has certificate | 285 |
79.8%
|
| 2 | Registered | 45 |
12.6%
|
| 8 | Don't know | 4 |
1.1%
|
| 9 | 23 | ||
| Sysmiss | 4102 |