| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 10 |
4.6%
|
| 0 | 76 |
34.7%
|
|
| 1 | 66 |
30.1%
|
|
| 2 | 33 |
15.1%
|
|
| 3 | 12 |
5.5%
|
|
| 4 | 22 |
10%
|