| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 5 |
0.7%
|
| -7 | Does not apply (spontaneous) | 7 |
0.9%
|
| 1 | Yes | 295 |
38.8%
|
| 2 | No | 453 |
59.6%
|