| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 47 |
4.3%
|
| 0 | 10 |
0.9%
|
|
| 1 | 104 |
9.5%
|
|
| 2 | 405 |
37%
|
|
| 3 | 270 |
24.6%
|
|
| 4 | 260 |
23.7%
|