| Value | Category | Cases | |
|---|---|---|---|
| 0 | no | 1284 |
33.9%
|
| 1 | yes | 2426 |
64%
|
| 8 | don't know | 60 |
1.6%
|
| 9 | 18 |
0.5%
|
|
| 11 | .Z | 14966 |