| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 11 |
1.1%
|
| -7 | Does not apply (spontaneous) | 36 |
3.7%
|
| 1 | Yes | 68 |
6.9%
|
| 2 | No | 864 |
88.3%
|