| Value | Category | Cases | |
|---|---|---|---|
| 0 | neither certificate or registered | 144 |
12.1%
|
| 1 | has certificate | 183 |
15.3%
|
| 2 | registered | 860 |
72%
|
| 8 | don't know | 8 |
0.7%
|
| Sysmiss | 11754 |