| Value | Category | Cases | |
|---|---|---|---|
| -99 | Don't know | 0 |
0%
|
| -9 | Don't know (spontaneous) | 43 |
5.3%
|
| -7 | 36 |
4.4%
|
|
| 1 | Yes | 107 |
13.2%
|
| 2 | No | 627 |
77.1%
|
| Sysmiss | 147 |