| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 2 |
0.5%
|
| -7 | Does not apply (spontaneous) | 41 |
10.9%
|
| 1 | Yes | 86 |
22.9%
|
| 2 | No | 247 |
65.7%
|
| Sysmiss | 1 |