| Value | Category | Cases | |
|---|---|---|---|
| 1 | std 6 | 2 |
2.6%
|
| 2 | std 7 | 8 |
10.5%
|
| 3 | std 8 | 43 |
56.6%
|
| 4 | std 9 | 23 |
30.3%
|
| Sysmiss | 2441 |