| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 7 |
0.1%
|
| -7 | Does not apply (spontaneous) | 774 |
8.3%
|
| 1 | Yes | 3402 |
36.3%
|
| 2 | No | 5193 |
55.4%
|