| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 2 |
0.2%
|
| -7 | Does not apply (spontaneous) | 3 |
0.3%
|
| 1 | Yes | 46 |
4.5%
|
| 2 | No | 962 |
95%
|