| Value | Category | Cases | |
|---|---|---|---|
| 0 | no | 2431 |
38.9%
|
| 1 | yes | 3754 |
60.1%
|
| 8 | don't know | 58 |
0.9%
|
| 9 | 4 |
0.1%
|
|
| 11 | .Z | 12507 |