| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 21 |
1.3%
|
| -7 | Does not apply (spontaneous) | 25 |
1.5%
|
| 1 | Yes | 196 |
12%
|
| 2 | No | 1394 |
85.2%
|
| Sysmiss | 27 |