| Value | Category | Cases | |
|---|---|---|---|
| 1 | Distributor | 23 |
10.8%
|
| 2 | School | 9 |
4.2%
|
| 3 | Any source | 142 |
67%
|
| 5 | Missing | 1 |
0.5%
|
| 6 | Other: Both school and distributor | 4 |
1.9%
|
| 9 | Not applicable | 33 |
15.6%
|