| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 17 |
2.2%
|
| 0 | 448 |
58.9%
|
|
| 10 | 2 |
0.3%
|
|
| 15 | 3 |
0.4%
|
|
| 20 | 9 |
1.2%
|
|
| 30 | 8 |
1.1%
|
|
| 40 | 4 |
0.5%
|
|
| 50 | 20 |
2.6%
|
|
| 80 | 2 |
0.3%
|
|
| 100 | 247 |
32.5%
|