| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 4 |
1.1%
|
| -7 | Does not apply (spontaneous) | 28 |
7.8%
|
| 1 | Yes | 35 |
9.7%
|
| 2 | No | 294 |
81.4%
|