| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 3 |
0.8%
|
| -7 | Does not apply | 1 |
0.3%
|
| 1 | Yes | 276 |
76.2%
|
| 2 | No | 82 |
22.7%
|
| Sysmiss | 2273 |