| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 6 |
1.6%
|
| -7 | Does not apply (spontaneous) | 16 |
4.3%
|
| 1 | Yes | 14 |
3.8%
|
| 2 | No | 332 |
90.2%
|