| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 5 |
0.8%
|
| 0 | 580 |
98%
|
|
| 10 | 1 |
0.2%
|
|
| 20 | 3 |
0.5%
|
|
| 40 | 1 |
0.2%
|
|
| 80 | 1 |
0.2%
|
|
| 90 | 1 |
0.2%
|