| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 17 |
2.9%
|
| -7 | Does not apply (spontaneous) | 69 |
11.7%
|
| 1 | Yes | 59 |
10%
|
| 2 | No | 446 |
75.5%
|
| Sysmiss | 10 |