| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 0 |
0%
|
| 0 | 9 |
6.7%
|
|
| 1 | 23 |
17%
|
|
| 2 | 51 |
37.8%
|
|
| 3 | 38 |
28.1%
|
|
| 4 | 14 |
10.4%
|