| Value | Category | Cases | |
|---|---|---|---|
| -9 | don't know | 0 |
0%
|
| -8 | refusal | 0 |
0%
|
| 1 | yes | 3 |
16.7%
|
| 2 | no | 15 |
83.3%
|
| Sysmiss | 1977 |