| Value | Category | Cases | |
|---|---|---|---|
| 0 | no | 3772 |
48.2%
|
| 1 | yes | 3936 |
50.3%
|
| 8 | don't know | 94 |
1.2%
|
| 9 | 18 |
0.2%
|
|
| 11 | .Z | 412 |