| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 2 |
0.6%
|
| -7 | Does not apply (spontaneous) | 12 |
3.4%
|
| 1 | Yes | 79 |
22.1%
|
| 2 | No | 264 |
73.9%
|
| Sysmiss | 1 |