| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 4 |
0.6%
|
| 1 | Yes | 65 |
10.4%
|
| 2 | No | 555 |
88.8%
|
| 3 | 1 |
0.2%
|
|
| Sysmiss | 807 |