| Value | Category | Cases | |
|---|---|---|---|
| 1 | inject | 17 |
3.3%
|
| 2 | swallow/eat/drink | 476 |
91.2%
|
| 3 | both | 1 |
0.2%
|
| 4 | smoke | 18 |
3.4%
|
| 5 | inhale | 8 |
1.5%
|
| 6 | no response | 2 |
0.4%
|
| Sysmiss | 38260 |