| Value | Category | Cases | |
|---|---|---|---|
| 1 | 1. Higher grade | 3 |
100%
|
| 2 | 2. Standard grade | 0 |
0%
|
| 3 | 3. Lower grade | 0 |
0%
|
| 9 | 9. Don't know | 0 |
0%
|
| Sysmiss | 231 |