| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 11 |
8.6%
|
| 0 | None | 101 |
78.9%
|
| 1 | 4 |
3.1%
|
|
| 2 | 3 |
2.3%
|
|
| 3 | 3 |
2.3%
|
|
| 5 | 2 |
1.6%
|
|
| 10 | 3 |
2.3%
|
|
| 30 | 1 |
0.8%
|
|
| Sysmiss | 517 |