| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 1 |
0.1%
|
| -7 | Does not apply (sponatneous) | 15 |
1.5%
|
| 1 | Yes | 142 |
13.9%
|
| 2 | No | 866 |
84.6%
|