| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 1 |
0.3%
|
| -7 | Does not apply (spontaneous) | 4 |
1.1%
|
| 1 | Yes | 150 |
39.9%
|
| 2 | No | 221 |
58.8%
|
| Sysmiss | 1 |