| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 7 |
0.6%
|
| -7 | Does not apply (spontaneous) | 6 |
0.5%
|
| 1 | Yes | 662 |
53.6%
|
| 2 | No | 559 |
45.3%
|
| Sysmiss | 5 |