| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 9 |
6.5%
|
| 0 | None | 97 |
69.8%
|
| 1 | 14 |
10.1%
|
|
| 2 | 4 |
2.9%
|
|
| 5 | 7 |
5%
|
|
| 10 | 4 |
2.9%
|
|
| 20 | 3 |
2.2%
|
|
| 40 | 1 |
0.7%
|
|
| Sysmiss | 1077 |