| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 15 |
4.3%
|
| 0 | 325 |
92.3%
|
|
| 15 | 1 |
0.3%
|
|
| 20 | 1 |
0.3%
|
|
| 25 | 3 |
0.9%
|
|
| 35 | 1 |
0.3%
|
|
| 40 | 1 |
0.3%
|
|
| 50 | 3 |
0.9%
|
|
| 70 | 1 |
0.3%
|
|
| 90 | 1 |
0.3%
|