| Value | Category | Cases | |
|---|---|---|---|
| 0 | None | 120 |
5.5%
|
| 1 | Primary | 302 |
13.7%
|
| 2 | Secondary | 1407 |
64%
|
| 3 | Tertiary | 370 |
16.8%
|
| Sysmiss | 1 |