| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 2 |
0.5%
|
| -7 | Does not apply (spontaneous) | 7 |
1.9%
|
| 1 | Yes | 23 |
6.3%
|
| 2 | No | 332 |
91.2%
|