| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 9 |
36%
|
| 0 | 5 |
20%
|
|
| 1 | 3 |
12%
|
|
| 2 | 7 |
28%
|
|
| 3 | 1 |
4%
|
|
| Sysmiss | 1071 |