| Value | Category | Cases | |
|---|---|---|---|
| 0 | None | 175 |
36.5%
|
| 1 | NVTI | 104 |
21.7%
|
| 2 | City and Guilds | 97 |
20.3%
|
| 3 | Other | 103 |
21.5%
|
| Sysmiss | 16689 |