| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 4 |
1%
|
| -7 | Does not apply (spontaneous) | 17 |
4.2%
|
| 1 | Yes | 77 |
19.2%
|
| 2 | No | 303 |
75.6%
|
| Sysmiss | 8 |