| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 0 |
0%
|
| -7 | Does not apply (sponatneous) | 17 |
1.7%
|
| 1 | Yes | 350 |
34.2%
|
| 2 | No | 657 |
64.2%
|