| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 18 |
5.3%
|
| -7 | Does not apply (spontaneous) | 22 |
6.4%
|
| 1 | Yes | 69 |
20.2%
|
| 2 | No | 233 |
68.1%
|
| Sysmiss | 10 |