| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 0 |
0%
|
| 0 | 148 |
90.8%
|
|
| 10 | 3 |
1.8%
|
|
| 20 | 6 |
3.7%
|
|
| 30 | 1 |
0.6%
|
|
| 40 | 1 |
0.6%
|
|
| 50 | 4 |
2.5%
|