| Value | Category | Cases | |
|---|---|---|---|
| 0 | None | 139 |
16.6%
|
| 1 | Primary | 308 |
36.7%
|
| 2 | Lower secondary | 265 |
31.6%
|
| 3 | Upper secondary | 58 |
6.9%
|
| 9 | Missing | 1 |
0.1%
|
| Sysmiss | 68 |
8.1%
|