| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 4 |
2.7%
|
| 0 | None | 59 |
39.9%
|
| 1 | 28 |
18.9%
|
|
| 2 | 15 |
10.1%
|
|
| 3 | 11 |
7.4%
|
|
| 4 | 1 |
0.7%
|
|
| 5 | 21 |
14.2%
|
|
| 10 | 4 |
2.7%
|
|
| 15 | 2 |
1.4%
|
|
| 20 | 3 |
2%
|
|
| Sysmiss | 184 |