| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 16 |
1.2%
|
| -7 | Does not apply (spontaneous) | 52 |
3.9%
|
| 1 | Yes | 263 |
19.7%
|
| 2 | No | 1004 |
75.2%
|
| Sysmiss | 2 |