| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 4 |
2.6%
|
| 0 | 143 |
94.1%
|
|
| 10 | 2 |
1.3%
|
|
| 20 | 1 |
0.7%
|
|
| 30 | 1 |
0.7%
|
|
| 100 | 1 |
0.7%
|