| Value | Category | Cases | |
|---|---|---|---|
| 0 | no | 7307 |
95.2%
|
| 1 | yes | 216 |
2.8%
|
| 8 | don't know | 137 |
1.8%
|
| 9 | 14 |
0.2%
|
|
| 11 | .Z | 29837 |