| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 12 |
10.9%
|
| 0 | None | 63 |
57.3%
|
| 1 | 26 |
23.6%
|
|
| 2 | 2 |
1.8%
|
|
| 5 | 3 |
2.7%
|
|
| 10 | 1 |
0.9%
|
|
| 13 | 1 |
0.9%
|
|
| 15 | 1 |
0.9%
|
|
| 20 | 1 |
0.9%
|
|
| Sysmiss | 845 |