| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 11 |
0.9%
|
| -7 | Does not apply (spontaneous) | 24 |
1.9%
|
| 1 | Yes | 518 |
42%
|
| 2 | No | 681 |
55.2%
|
| Sysmiss | 5 |