| Value | Category | Cases | |
|---|---|---|---|
| 0 | No | 14045 |
94.1%
|
| 1 | Yes: don't know which drug taken | 784 |
5.3%
|
| 8 | Don't know | 94 |
0.6%
|
| 9 | 26 | ||
| Sysmiss | 68642 |