| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 0 |
0%
|
| -7 | Does not apply | 2 |
2.6%
|
| 1 | Yes | 19 |
24.7%
|
| 2 | No | 56 |
72.7%
|
| Sysmiss | 434 |