| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 2 |
1.5%
|
| 0 | 20 |
14.8%
|
|
| 1 | 59 |
43.7%
|
|
| 2 | 46 |
34.1%
|
|
| 3 | 6 |
4.4%
|
|
| 4 | 2 |
1.5%
|