| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 0 |
0%
|
| -7 | Does not apply (sponatneous) | 13 |
1.3%
|
| 1 | Yes | 198 |
19.3%
|
| 2 | No | 813 |
79.4%
|