| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 1 |
0.1%
|
| -7 | Does not apply (sponatneous) | 7 |
0.7%
|
| 1 | Yes | 625 |
61%
|
| 2 | No | 391 |
38.2%
|