| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 1 |
0.3%
|
| -7 | Does not apply (spontaneous) | 9 |
2.5%
|
| 1 | Yes | 55 |
15.3%
|
| 2 | No | 295 |
81.9%
|