| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 13 |
1.7%
|
| -7 | Does not apply (spontaneous) | 95 |
12.3%
|
| 1 | Yes | 161 |
20.9%
|
| 2 | No | 503 |
65.2%
|