| Value | Category | Cases | |
|---|---|---|---|
| 1 | none | 1211 |
9.7%
|
| 2 | primary | 4540 |
36.3%
|
| 3 | secondary | 4752 |
38%
|
| 4 | higher | 937 |
7.5%
|
| 9 | missing/dk | 29 |
0.2%
|
| Sysmiss | 1031 |
8.2%
|