| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 1 |
0.7%
|
| -7 | Does not apply (spontaneous) | 3 |
2%
|
| 1 | Yes | 12 |
7.9%
|
| 2 | No | 136 |
89.5%
|