| Value | Category | Cases | |
|---|---|---|---|
| -99 | Don't know | 0 |
0%
|
| -77 | Does not apply | 0 |
0%
|
| -9 | Don't know (spontaneous) | 3 |
1.4%
|
| -7 | Does not apply (spontaneous) | 4 |
1.9%
|
| 1 | Yes | 25 |
11.7%
|
| 2 | No | 181 |
85%
|
| Sysmiss | 145 |