| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 645 |
20.8%
|
| -7 | Does not apply (spontaneous) | 178 |
5.7%
|
| 1 | Yes | 363 |
11.7%
|
| 2 | No | 1919 |
61.8%
|