| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 35 |
8.7%
|
| 0 | 323 |
80.3%
|
|
| 5 | 4 |
1%
|
|
| 10 | 10 |
2.5%
|
|
| 11 | 1 |
0.2%
|
|
| 15 | 1 |
0.2%
|
|
| 20 | 10 |
2.5%
|
|
| 25 | 1 |
0.2%
|
|
| 30 | 4 |
1%
|
|
| 40 | 4 |
1%
|
|
| 50 | 4 |
1%
|
|
| 55 | 1 |
0.2%
|
|
| 60 | 1 |
0.2%
|
|
| 100 | 3 |
0.7%
|