| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 4 |
1.1%
|
| -7 | Does not apply (spontaneous) | 11 |
3%
|
| 1 | Yes | 99 |
27.3%
|
| 2 | No | 249 |
68.6%
|
| Sysmiss | 2 |