| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 0 |
0%
|
| 2 | 7 |
38.9%
|
|
| 3 | 10 |
55.6%
|
|
| 5 | 1 |
5.6%
|
|
| Sysmiss | 139 |