| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 5 |
2.1%
|
| -7 | Does not apply (spontaneous) | 21 |
8.7%
|
| 1 | Yes | 34 |
14%
|
| 2 | No | 182 |
75.2%
|