| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 3 |
1.4%
|
| 0 | 183 |
87.6%
|
|
| 5 | 5 |
2.4%
|
|
| 6 | 1 |
0.5%
|
|
| 10 | 3 |
1.4%
|
|
| 15 | 2 |
1%
|
|
| 20 | 3 |
1.4%
|
|
| 30 | 7 |
3.3%
|
|
| 50 | 1 |
0.5%
|
|
| 60 | 1 |
0.5%
|