| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 3 |
0.2%
|
| -7 | Does not apply (spontaneous) | 35 |
2%
|
| 1 | Yes | 80 |
4.6%
|
| 2 | No | 1607 |
93.2%
|