| Value | Category | Cases | |
|---|---|---|---|
| 0 | 6 |
0.2%
|
|
| 1 | yes | 917 |
28.3%
|
| 2 | no | 2320 |
71.5%
|
| 77 | don't know | 0 |
0%
|
| Sysmiss | 961 |