| Value | Category | Cases | |
|---|---|---|---|
| 0 | no | 959 |
96.8%
|
| 1 | yes | 22 |
2.2%
|
| 8 | don't know | 6 |
0.6%
|
| 9 | 4 |
0.4%
|
|
| 11 | .Z | 17763 |