| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 0 |
0%
|
| 0 | 1164 |
88%
|
|
| 5 | 5 |
0.4%
|
|
| 10 | 30 |
2.3%
|
|
| 15 | 18 |
1.4%
|
|
| 20 | 54 |
4.1%
|
|
| 25 | 19 |
1.4%
|
|
| 30 | 16 |
1.2%
|
|
| 35 | 5 |
0.4%
|
|
| 40 | 7 |
0.5%
|
|
| 50 | 4 |
0.3%
|