| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 1 |
1.7%
|
| -7 | Does not apply (spontaneous) | 7 |
11.9%
|
| 0 | 18 |
30.5%
|
|
| 100 | 33 |
55.9%
|
|
| Sysmiss | 61 |