| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 8 |
0.1%
|
| -7 | Does not apply (spontaneous) | 560 |
6%
|
| 1 | Yes | 4960 |
52.9%
|
| 2 | No | 3848 |
41%
|