| Value | Category | Cases | |
|---|---|---|---|
| 1 | Not effective at all | 3 |
2.5%
|
| 2 | 1 |
0.8%
|
|
| 3 | 4 |
3.3%
|
|
| 4 | 5 |
4.1%
|
|
| 5 | 10 |
8.3%
|
|
| 6 | 7 |
5.8%
|
|
| 7 | 13 |
10.7%
|
|
| 8 | 11 |
9.1%
|
|
| 9 | 11 |
9.1%
|
|
| 10 | Very effective | 6 |
5%
|
| 11 | Don't know | 50 |
41.3%
|