| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 0 |
0%
|
| 0 | 169 |
97.7%
|
|
| 10 | 2 |
1.2%
|
|
| 15 | 1 |
0.6%
|
|
| 20 | 1 |
0.6%
|