| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 530 |
17.1%
|
| -7 | Does not apply (spontaneous) | 114 |
3.7%
|
| 1 | Yes | 801 |
25.8%
|
| 2 | No | 1660 |
53.5%
|