| Value | Category | Cases | |
|---|---|---|---|
| 0 | neither certificate or registered | 220 |
12.8%
|
| 1 | has certificate | 294 |
17.2%
|
| 2 | registered | 1196 |
69.8%
|
| 8 | don't know | 3 |
0.2%
|
| Sysmiss | 11236 |