| Value | Category | Cases | |
|---|---|---|---|
| 1 | 1. higher grade | 5 |
6.8%
|
| 2 | 2. standard grade | 9 |
12.3%
|
| 3 | 3. lower grade | 2 |
2.7%
|
| 7 | 7. did not take | 51 |
69.9%
|
| 9 | 9. don't know | 6 |
8.2%
|
| Sysmiss | 926 |