| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 21 |
1.3%
|
| -7 | Does not apply (spontaneous) | 30 |
1.8%
|
| 1 | Yes | 114 |
7%
|
| 2 | No | 1471 |
89.9%
|
| Sysmiss | 27 |