| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 1 |
0.1%
|
| -7 | Does not apply (spontaneous) | 17 |
1.8%
|
| 1 | Yes | 29 |
3.1%
|
| 2 | No | 900 |
95%
|