| Valeur | Catégorie | le cas | |
|---|---|---|---|
| 0 | neither certificate or registered | 3 |
30%
|
| 1 | has certificate | 3 |
30%
|
| 2 | registered | 4 |
40%
|
| 8 | don't know | 0 |
0%
|
| Sysmiss | 13241 |