| Value | Category | Cases | |
|---|---|---|---|
| 1 | Not effective at all | 1 |
0.4%
|
| 2 | 4 |
1.5%
|
|
| 3 | 8 |
3%
|
|
| 4 | 19 |
7.1%
|
|
| 5 | 49 |
18.3%
|
|
| 6 | 42 |
15.7%
|
|
| 7 | 47 |
17.5%
|
|
| 8 | 51 |
19%
|
|
| 9 | 22 |
8.2%
|
|
| 10 | Very effective | 25 |
9.3%
|
| 11 | Don't know | 38 |