| Value | Category | Cases | |
|---|---|---|---|
| -99 | Don't know | 0 |
0%
|
| -77 | Does not apply | 0 |
0%
|
| -9 | Don't know (spontaneous) | 1 |
1.2%
|
| -7 | Does not apply (spontaneous) | 0 |
0%
|
| 1 | Yes | 16 |
19%
|
| 2 | No | 67 |
79.8%
|
| Sysmiss | 275 |