| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 10 |
0.7%
|
| -7 | Does not apply (spontaneous) | 32 |
2.3%
|
| 1 | Yes | 66 |
4.7%
|
| 2 | No | 1308 |
92.4%
|