| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 15 |
39.5%
|
| 1 | 13 |
34.2%
|
|
| 2 | 5 |
13.2%
|
|
| 3 | 3 |
7.9%
|
|
| 4 | 2 |
5.3%
|
|
| Sysmiss | 107 |