| Value | Category | Cases | |
|---|---|---|---|
| 0 | no | 2855 |
92.5%
|
| 1 | yes | 223 |
7.2%
|
| 8 | don't know | 3 |
0.1%
|
| 9 | 4 |
0.1%
|
|
| 11 | .Z | 15669 |