| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 0 |
0%
|
| 10 | 2 |
50%
|
|
| 12 | 1 |
25%
|
|
| 22 | 1 |
25%
|
|
| Sysmiss | 1514 |