| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 5 |
0.5%
|
| -7 | Does not apply (spontaneous) | 15 |
1.4%
|
| 1 | Yes | 170 |
16%
|
| 2 | No | 871 |
82.1%
|
| Sysmiss | 1008 |