| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 11 |
0.7%
|
| -7 | Does not apply (spontaneous) | 4 |
0.3%
|
| 1 | Yes | 183 |
11.6%
|
| 2 | No | 1375 |
87.4%
|