| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 100 |
7.6%
|
| -7 | Does not apply (spontaneous) | 62 |
4.7%
|
| 1 | Yes | 329 |
25.1%
|
| 2 | No | 820 |
62.5%
|
| Sysmiss | 58 |