| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 3 |
0.3%
|
| -7 | Does not apply (spontaneous) | 23 |
2.2%
|
| 1 | Yes | 266 |
25.1%
|
| 2 | No | 769 |
72.5%
|
| Sysmiss | 1008 |