| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 2 |
0.6%
|
| -7 | Does not apply (spontaneous) | 6 |
1.7%
|
| 1 | Yes | 75 |
20.8%
|
| 2 | No | 277 |
76.9%
|