| Value | Category | Cases | |
|---|---|---|---|
| 1 | 1. higher grade | 16 |
40%
|
| 2 | 2. standard grade | 8 |
20%
|
| 3 | 3. lower grade | 1 |
2.5%
|
| 7 | 7. did not take | 15 |
37.5%
|
| 99 | 99. don't know | 0 |
0%
|
| Sysmiss | 59 |