| Value | Category | Cases | |
|---|---|---|---|
| 0 | 21 |
80.8%
|
|
| 4 | 1 |
3.8%
|
|
| 10 | 1 |
3.8%
|
|
| 15 | 2 |
7.7%
|
|
| 20 | 1 |
3.8%
|
|
| Sysmiss | 21 |