| Value | Category | Cases | |
|---|---|---|---|
| 0 | Neither certificate or registered | 32 |
31.7%
|
| 1 | Has certificate | 24 |
23.8%
|
| 2 | Registered | 43 |
42.6%
|
| 8 | Don't know | 2 |
2%
|
| 9 | 8 | ||
| Sysmiss | 36321 |