| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 2 |
25%
|
| 2 | 1 |
12.5%
|
|
| 4 | 2 |
25%
|
|
| 7 | 1 |
12.5%
|
|
| 8 | 1 |
12.5%
|
|
| 12 | 1 |
12.5%
|
|
| Sysmiss | 1000 |