| Value | Category | Cases | |
|---|---|---|---|
| 0 | No | 9265 |
99.1%
|
| 1 | Yes: don't know which drug taken | 72 |
0.8%
|
| 8 | Don't know | 8 |
0.1%
|
| 9 | 8 | ||
| Sysmiss | 39854 |