| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 7 |
1.3%
|
| -7 | Does not apply (spontaneous) | 518 |
97.4%
|
| 70 | 1 |
0.2%
|
|
| 100 | 6 |
1.1%
|