| Value | Category | Cases | |
|---|---|---|---|
| 0 | Neither certificate or registered | 336 |
35.7%
|
| 1 | Has certificate | 198 |
21%
|
| 2 | Registered | 381 |
40.4%
|
| 8 | Don't know | 27 |
2.9%
|
| 9 | 30 | ||
| Sysmiss | 35458 |