| Value | Category | Cases | |
|---|---|---|---|
| 1 | Not effective at all | 2 |
0.7%
|
| 2 | 10 |
3.6%
|
|
| 3 | 13 |
4.7%
|
|
| 4 | 21 |
7.6%
|
|
| 5 | 50 |
18.2%
|
|
| 6 | 41 |
14.9%
|
|
| 7 | 44 |
16%
|
|
| 8 | 54 |
19.6%
|
|
| 9 | 22 |
8%
|
|
| 10 | Very effective | 18 |
6.5%
|
| 11 | Don't know | 31 |