| Value | Category | Cases | |
|---|---|---|---|
| 0 | no | 49 |
0.8%
|
| 1 | yes: don't know which drug taken | 6380 |
98.9%
|
| 8 | don't know | 12 |
0.2%
|
| 9 | 7 |
0.1%
|
|
| 11 | .Z | 1784 |