| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 2 |
0.5%
|
| -7 | Does not apply (spontaneous) | 16 |
4.3%
|
| 1 | Yes | 205 |
54.5%
|
| 2 | No | 153 |
40.7%
|
| Sysmiss | 1 |