| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 12 |
3.5%
|
| -7 | Does not apply (spontaneous) | 35 |
10.2%
|
| 1 | Yes | 58 |
17%
|
| 2 | No | 237 |
69.3%
|
| Sysmiss | 10 |