| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 1 |
0.3%
|
| -7 | Does not apply (spontaneous) | 14 |
3.9%
|
| 1 | Yes | 249 |
69.6%
|
| 2 | No | 94 |
26.3%
|
| Sysmiss | 1 |