| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 3 |
1.2%
|
| -7 | Does not apply (spontaneous) | 15 |
6.2%
|
| 1 | Yes | 39 |
16.1%
|
| 2 | No | 185 |
76.4%
|