| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 32 |
1.2%
|
| -7 | Does not apply (spontaneous) | 6 |
0.2%
|
| 1 | Yes | 261 |
9.7%
|
| 2 | No | 2398 |
88.9%
|