| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 4 |
0.9%
|
| -7 | Does not apply (spontaneous) | 14 |
3.3%
|
| 1 | Yes | 196 |
46%
|
| 2 | No | 212 |
49.8%
|
| Sysmiss | 3 |