| Value | Category | Cases | |
|---|---|---|---|
| 0 | no | 5352 |
83%
|
| 1 | yes | 1071 |
16.6%
|
| 8 | don't know | 21 |
0.3%
|
| 9 | 4 |
0.1%
|
|
| 11 | .Z | 1784 |