| Value | Category | Cases | |
|---|---|---|---|
| -99 | Don't know | 1 |
0.1%
|
| -77 | Does not apply | 0 |
0%
|
| -9 | Don't know (spontaneous) | 0 |
0%
|
| -7 | Does not apply (spontaneous) | 57 |
7.3%
|
| 1 | Yes | 161 |
20.6%
|
| 2 | No | 562 |
72%
|
| Sysmiss | 315 |