| Value | Category | Cases | |
|---|---|---|---|
| -99 | -99 (don't know) | 14 |
2.6%
|
| -66 | -66 (refuse to answer) | 4 |
0.7%
|
| 0 | No | 516 |
95.7%
|
| 1 | Yes | 5 |
0.9%
|
| Sysmiss | 577 |