| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 9 |
2.5%
|
| -7 | Does not apply | 2 |
0.6%
|
| 1 | Yes | 166 |
45.9%
|
| 2 | No | 185 |
51.1%
|
| Sysmiss | 2273 |