| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 5 |
5.2%
|
| 0 | 49 |
50.5%
|
|
| 1 | 32 |
33%
|
|
| 2 | 9 |
9.3%
|
|
| 3 | 1 |
1%
|
|
| 4 | 1 |
1%
|