| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 6 |
0.7%
|
| -7 | Does not apply (spontaneous) | 132 |
16.2%
|
| 1 | Yes | 292 |
35.9%
|
| 2 | No | 383 |
47.1%
|
| Sysmiss | 147 |