| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 26 |
1.9%
|
| -7 | Does not apply (spontaneous) | 20 |
1.5%
|
| 1 | Yes | 166 |
12.4%
|
| 2 | No | 1123 |
84.1%
|
| Sysmiss | 2 |