| Valeur | Catégorie | le cas | |
|---|---|---|---|
| 0 | Neither certificate or registered | 22 |
4.5%
|
| 1 | Has certificate | 412 |
84.6%
|
| 2 | Registered | 50 |
10.3%
|
| 8 | Don't know | 3 |
0.6%
|
| 9 | 24 | ||
| Sysmiss | 3971 |