| Value | Category | Cases | |
|---|---|---|---|
| 0 | 30 |
96.8%
|
|
| 1 | yes | 1 |
3.2%
|
| 2 | no | 0 |
0%
|
| 77 | refused | 0 |
0%
|
| 88 | don't know | 0 |
0%
|
| 99 | missing | 0 |
0%
|
| Sysmiss | 4939 |