| Value | Category | Cases | |
|---|---|---|---|
| 0 | no | 6104 |
79.5%
|
| 1 | yes | 1551 |
20.2%
|
| 8 | don't know | 11 |
0.1%
|
| 9 | 8 |
0.1%
|
|
| 11 | .Z | 29837 |