| Value | Category | Cases | |
|---|---|---|---|
| 0 | no | 133 |
20.9%
|
| 1 | yes | 485 |
76.3%
|
| 8 | don't know | 11 |
1.7%
|
| 9 | 7 |
1.1%
|
|
| 11 | .Z | 18118 |