| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 20 |
1.2%
|
| -7 | Does not apply (spontaneous) | 24 |
1.5%
|
| 1 | Yes | 123 |
7.5%
|
| 2 | No | 1469 |
89.8%
|
| Sysmiss | 27 |