| Value | Category | Cases | |
|---|---|---|---|
| 0 | no | 6416 |
99.5%
|
| 1 | yes | 13 |
0.2%
|
| 8 | don't know | 12 |
0.2%
|
| 9 | 7 |
0.1%
|
|
| 11 | .Z | 1784 |