| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 2 |
0.4%
|
| -7 | Does not apply (spontaneous) | 105 |
19.7%
|
| 1 | Yes | 158 |
29.6%
|
| 2 | No | 268 |
50.3%
|
| Sysmiss | 68 |