| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 15 |
4.9%
|
| 0 | 282 |
91.9%
|
|
| 5 | 1 |
0.3%
|
|
| 30 | 1 |
0.3%
|
|
| 40 | 1 |
0.3%
|
|
| 100 | 7 |
2.3%
|