| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 1 |
0.2%
|
| -7 | Does not apply (spontaneous) | 21 |
3.5%
|
| 1 | Yes | 60 |
10.1%
|
| 2 | No | 510 |
86.1%
|