| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 2 |
0.6%
|
| -7 | Does not apply (spontaneous) | 62 |
17.3%
|
| 1 | Yes | 27 |
7.5%
|
| 2 | No | 267 |
74.6%
|
| Sysmiss | 1 |