| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 24 |
6.7%
|
| -7 | Does not apply (spontaneous) | 43 |
12%
|
| 1 | Yes | 66 |
18.4%
|
| 2 | No | 225 |
62.8%
|
| Sysmiss | 1 |