| Value | Category | Cases | |
|---|---|---|---|
| 0 | no | 1374 |
94.8%
|
| 1 | yes | 20 |
1.4%
|
| 8 | don't know | 45 |
3.1%
|
| 9 | 10 |
0.7%
|
|
| 11 | .Z | 17305 |