| Value | Category | Cases | |
|---|---|---|---|
| 1 | Not effective at all | 1 |
1.1%
|
| 2 | 6 |
6.4%
|
|
| 3 | 3 |
3.2%
|
|
| 4 | 6 |
6.4%
|
|
| 5 | 7 |
7.4%
|
|
| 6 | 10 |
10.6%
|
|
| 7 | 15 |
16%
|
|
| 8 | 12 |
12.8%
|
|
| 9 | 14 |
14.9%
|
|
| 10 | Very effective | 12 |
12.8%
|
| 11 | Don't know | 8 |
8.5%
|