| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 4 |
1.1%
|
| -7 | Does not apply (spontaneous) | 19 |
5.3%
|
| 1 | Yes | 30 |
8.3%
|
| 2 | No | 308 |
85.3%
|