| Value | Category | Cases | |
|---|---|---|---|
| 0 | no | 1388 |
36.6%
|
| 1 | yes | 2329 |
61.5%
|
| 8 | don't know | 53 |
1.4%
|
| 9 | 18 |
0.5%
|
|
| 11 | .Z | 14966 |