| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 4 |
3.6%
|
| 0 | 98 |
88.3%
|
|
| 10 | 3 |
2.7%
|
|
| 20 | 3 |
2.7%
|
|
| 30 | 1 |
0.9%
|
|
| 50 | 1 |
0.9%
|
|
| 100 | 1 |
0.9%
|