| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 4 |
1.1%
|
| -7 | Does not apply (spontaneous) | 5 |
1.3%
|
| 1 | Yes | 99 |
26.2%
|
| 2 | No | 270 |
71.4%
|