| Value | Category | Cases | |
|---|---|---|---|
| 0 | no | 2939 |
37.6%
|
| 1 | yes | 4791 |
61.3%
|
| 8 | don't know | 74 |
0.9%
|
| 9 | 16 |
0.2%
|
|
| 11 | .Z | 412 |