| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 9 |
2.5%
|
| 0 | 328 |
89.9%
|
|
| 10 | 18 |
4.9%
|
|
| 20 | 5 |
1.4%
|
|
| 25 | 2 |
0.5%
|
|
| 30 | 1 |
0.3%
|
|
| 50 | 2 |
0.5%
|