| Valeur | Catégorie | le cas | |
|---|---|---|---|
| 0 | Neither certificate or registered | 140 |
22.9%
|
| 1 | Has certificate | 310 |
50.7%
|
| 2 | Registered | 154 |
25.2%
|
| 8 | Don't know | 1 |
0.2%
|
| 9 | 6 |
1%
|
|
| Sysmiss | 13813 |