| Value | Category | Cases | |
|---|---|---|---|
| 0 | No | 1481 |
39.5%
|
| 1 | Yes, took no drug | 2182 |
58.2%
|
| 8 | Don't know | 89 |
2.4%
|
| 9 | Missing | 23 | |
| Sysmiss | 19263 |