| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 2 |
3.2%
|
| 0 | None | 29 |
46.8%
|
| 1 | 22 |
35.5%
|
|
| 2 | 8 |
12.9%
|
|
| 3 | 1 |
1.6%
|
|
| Sysmiss | 35 |