| Value | Category | Cases | |
|---|---|---|---|
| 0 | no | 5721 |
74.6%
|
| 1 | yes | 1933 |
25.2%
|
| 8 | don't know | 12 |
0.2%
|
| 9 | 8 |
0.1%
|
|
| 11 | .Z | 29837 |