| Value | Category | Cases | |
|---|---|---|---|
| 0 | Neither certificate or registered | 420 |
32.9%
|
| 1 | Has certificate | 361 |
28.2%
|
| 2 | Registered | 476 |
37.2%
|
| 8 | DK | 21 |
1.6%
|
| 9 | 24 | ||
| Sysmiss | 7755 |