| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 0 |
0%
|
| 0 | 40 |
33.3%
|
|
| 1 | 39 |
32.5%
|
|
| 2 | 21 |
17.5%
|
|
| 3 | 14 |
11.7%
|
|
| 4 | 6 |
5%
|