| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 23 |
1.4%
|
| -7 | Does not apply (spontaneous) | 13 |
0.8%
|
| 1 | Yes | 351 |
21.5%
|
| 2 | No | 1249 |
76.3%
|
| Sysmiss | 27 |