| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 9 |
0.1%
|
| -7 | Does not apply (spontaneous) | 902 |
9.6%
|
| 1 | Yes | 4124 |
44%
|
| 2 | No | 4341 |
46.3%
|