| Value | Category | Cases | |
|---|---|---|---|
| 1 | inject | 24 |
1.6%
|
| 2 | swallow/eat/drink | 1462 |
97.3%
|
| 3 | both | 1 |
0.1%
|
| 4 | smoke | 8 |
0.5%
|
| 5 | inhale | 1 |
0.1%
|
| 6 | no response | 7 |
0.5%
|
| Sysmiss | 37279 |