| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 8 |
2.6%
|
| -7 | Does not apply (spontaneous) | 6 |
2%
|
| 1 | Yes | 79 |
25.7%
|
| 2 | No | 214 |
69.7%
|