| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 10 |
11.1%
|
| 0 | None | 71 |
78.9%
|
| 1 | 2 |
2.2%
|
|
| 3 | 1 |
1.1%
|
|
| 5 | 3 |
3.3%
|
|
| 10 | 3 |
3.3%
|
|
| Sysmiss | 270 |