| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 7 |
1.9%
|
| -7 | Does not apply (spontaneous) | 14 |
3.9%
|
| 1 | Yes | 33 |
9.1%
|
| 2 | No | 307 |
85%
|