| Value | Category | Cases | |
|---|---|---|---|
| -99 | Could not observe | 9 |
1.1%
|
| -98 | Refused to be observed | 3 |
0.4%
|
| 1 | Yes | 19 |
2.4%
|
| 2 | No | 764 |
96.1%
|
| Sysmiss | 2470 |