| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 42 |
11.1%
|
| -7 | Does not apply (spontaneous) | 298 |
79%
|
| 0 | 5 |
1.3%
|
|
| 1 | 8 |
2.1%
|
|
| 10 | 1 |
0.3%
|
|
| 50 | 1 |
0.3%
|
|
| 60 | 1 |
0.3%
|
|
| 100 | 21 |
5.6%
|