| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 3 |
0.5%
|
| -7 | Does not apply (spontaneous) | 78 |
13.4%
|
| 1 | Yes | 117 |
20.1%
|
| 2 | No | 383 |
65.9%
|