| Valeur | Catégorie | le cas | |
|---|---|---|---|
| 0 | Neither certificate or registered | 29 |
22.5%
|
| 1 | Has certificate | 70 |
54.3%
|
| 2 | Registered | 29 |
22.5%
|
| 8 | Don't know | 0 |
0%
|
| 9 | 1 |
0.8%
|
|
| Sysmiss | 14295 |