| Value | Category | Cases | |
|---|---|---|---|
| 0 | no | 3009 |
97.5%
|
| 1 | yes | 42 |
1.4%
|
| 8 | don't know | 30 |
1%
|
| 9 | 4 |
0.1%
|
|
| 11 | .Z | 15669 |