| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 1 |
0.5%
|
| -7 | Does not apply (spontaneous) | 31 |
14.8%
|
| 1 | Yes | 20 |
9.6%
|
| 2 | No | 157 |
75.1%
|
| Sysmiss | 302 |