| Value | Category | Cases | |
|---|---|---|---|
| -99 | Could not observe | 12 |
1.5%
|
| -98 | Refused to be observed | 3 |
0.4%
|
| 1 | Yes | 40 |
5%
|
| 2 | No | 740 |
93.1%
|
| Sysmiss | 2470 |