| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 13 |
3.2%
|
| 0 | 370 |
92%
|
|
| 25 | 1 |
0.2%
|
|
| 30 | 2 |
0.5%
|
|
| 50 | 1 |
0.2%
|
|
| 100 | 15 |
3.7%
|