| Value | Category | Cases | |
|---|---|---|---|
| 0 | no | 2917 |
94.6%
|
| 1 | yes | 158 |
5.1%
|
| 8 | don't know | 6 |
0.2%
|
| 9 | 4 |
0.1%
|
|
| 11 | .Z | 15669 |