| Value | Category | Cases | |
|---|---|---|---|
| 0 | no | 1121 |
98.8%
|
| 1 | yes | 2 |
0.2%
|
| 8 | don't know | 6 |
0.5%
|
| 9 | 6 |
0.5%
|
|
| 11 | .Z | 7097 |