| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 17 |
19.5%
|
| 0 | None | 59 |
67.8%
|
| 1 | 7 |
8%
|
|
| 2 | 1 |
1.1%
|
|
| 5 | 1 |
1.1%
|
|
| 10 | 2 |
2.3%
|
|
| Sysmiss | 387 |