| Value | Category | Cases | |
|---|---|---|---|
| 1 | none | 346 |
2.8%
|
| 2 | primary | 3550 |
28.4%
|
| 3 | secondary | 6802 |
54.5%
|
| 4 | higher | 640 |
5.1%
|
| 9 | missing/dk | 1 |
0%
|
| Sysmiss | 1149 |
9.2%
|