| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 8 |
0.6%
|
| -7 | Does not apply (spontaneous) | 40 |
3.1%
|
| 1 | Yes | 27 |
2.1%
|
| 2 | No | 1225 |
94.2%
|