| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 0 |
0%
|
| -7 | Does not apply (spontaneous) | 36 |
9.6%
|
| 1 | Yes | 41 |
10.9%
|
| 2 | No | 298 |
79.5%
|