| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 12 |
3.5%
|
| -7 | Does not apply (spontaneous) | 31 |
9.1%
|
| 1 | Yes | 83 |
24.3%
|
| 2 | No | 216 |
63.2%
|
| Sysmiss | 10 |