| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 2 |
1.7%
|
| 0 | 115 |
95.8%
|
|
| 20 | 1 |
0.8%
|
|
| 25 | 1 |
0.8%
|
|
| 30 | 1 |
0.8%
|