| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 54 |
8.2%
|
| -7 | Does not apply (spontaneous) | 109 |
16.5%
|
| 1 | Yes | 87 |
13.2%
|
| 2 | No | 411 |
62.2%
|
| Sysmiss | 435 |