| Value | Category | Cases | |
|---|---|---|---|
| 1 | 1. higher grade | 7 |
9.6%
|
| 2 | 2. standard grade | 16 |
21.9%
|
| 3 | 3. lower grade | 1 |
1.4%
|
| 7 | 7. did not take | 42 |
57.5%
|
| 9 | 9. don't know | 7 |
9.6%
|
| Sysmiss | 926 |