| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 6 |
1%
|
| -7 | Does not apply (spontaneous) | 66 |
11.2%
|
| 1 | Yes | 168 |
28.4%
|
| 2 | No | 351 |
59.4%
|
| Sysmiss | 10 |