| Value | Category | Cases | |
|---|---|---|---|
| -99 | Don't know | 0 |
0%
|
| -9 | Don't know (spontaneous) | 3 |
0.6%
|
| -7 | 18 |
3.4%
|
|
| 1 | Yes | 46 |
8.7%
|
| 2 | No | 463 |
87.4%
|
| Sysmiss | 70 |