| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 40 |
27.6%
|
| 0 | 100 |
69%
|
|
| 5 | 2 |
1.4%
|
|
| 10 | 1 |
0.7%
|
|
| 30 | 2 |
1.4%
|