| Value | Category | Cases | |
|---|---|---|---|
| 0 | neither certificate or registered | 60 |
16%
|
| 1 | has certificate | 61 |
16.3%
|
| 2 | registered | 250 |
66.8%
|
| 8 | don't know | 3 |
0.8%
|
| Sysmiss | 12575 |