| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 1 |
0.3%
|
| 0 | 357 |
98.3%
|
|
| 10 | 3 |
0.8%
|
|
| 30 | 1 |
0.3%
|
|
| 50 | 1 |
0.3%
|