| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 0 |
0%
|
| -7 | Does not apply (sponatneous) | 21 |
2.1%
|
| 1 | Yes | 189 |
18.5%
|
| 2 | No | 814 |
79.5%
|