| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 42 |
3%
|
| -7 | Does not apply (spontaneous) | 52 |
3.7%
|
| 1 | Yes | 183 |
13%
|
| 2 | No | 1136 |
80.4%
|
| Sysmiss | 33 |