| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 3 |
1.5%
|
| -7 | Does not apply (spontaneous) | 16 |
8%
|
| 1 | Yes | 31 |
15.4%
|
| 2 | No | 151 |
75.1%
|
| Sysmiss | 818 |