| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 1 |
0.1%
|
| -7 | Does not apply (spontaneous) | 23 |
2.3%
|
| 1 | Yes | 534 |
53.5%
|
| 2 | No | 440 |
44.1%
|