| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 0 |
0%
|
| -7 | Does not apply (spontaneous) | 4 |
0.7%
|
| 1 | Yes | 41 |
6.7%
|
| 2 | No | 570 |
92.7%
|