| Valeur | Catégorie | le cas | |
|---|---|---|---|
| 0 | Neither certificate or registered | 25 |
5.1%
|
| 1 | Has certificate | 427 |
86.4%
|
| 2 | Registered | 38 |
7.7%
|
| 8 | Don't know | 4 |
0.8%
|
| 9 | 46 | ||
| Sysmiss | 3942 |